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Factors of 129: Prime Factorization, Methods, and Examples

The numbers that divide 129 into equal parts are known as the factors of 129. 129 is an odd composite number. Therefore it has more than 2 factors, unlike prime numbers. 129 has 4 factors in total. The factors of 129 can be negative as well with the only difference of sign.

Factors of 129

Here are the factors of number 129.

Factors of 129: 1, 3, 43, 129

Negative Factors of 129

The negative factors of 129 are similar to its positive factors, just with a negative sign.

Negative Factors of 129: -1, -3, -43, and -129

Prime Factorization of 129

The prime factorization of 129 is the way of expressing its prime factors in the product form.

Prime Factorization: 3 x 43

In this article, we will learn about the factors of 129 and how to find them using various techniques such as upside-down division, prime factorization, and factor tree.

What Are the Factors of 129?

The factors of 129 are 1, 3, 43, and 129. All of these numbers are the factors as they do not leave any remainder when divided by 129.

The factors of 129 are classified as prime numbers and composite numbers. The prime factors of the number 129 can be determined using the prime factorization technique.

How To Find the Factors of 129?

You can find the factors of 129 by using the rules of divisibility. The divisibility rule states that any number, when divided by any other natural number, is said to be divisible by the number if the quotient is the whole number and the resulting remainder is zero.

To find the factors of 129, create a list containing the numbers that are exactly divisible by 129 with zero remainders. One important thing to note is that 1 and 129 are the 129’s factors as every natural number has 1 and the number itself as its factor.

1 is also called the universal factor of every number. The factors of 129 are determined as follows:

\[\dfrac{129}{1} = 129\]

\[\dfrac{129}{3} = 43\]

\[\dfrac{129}{43} = 3\]

\[\dfrac{129}{129} = 1\]

Therefore, 1, 3, 43, and 129 are the factors of 129.

Total Number of Factors of 129

For 129 there are 4 positive factors and 4 negative ones. So in total, there are 8 factors of 129. 

To find the total number of factors of the given number, follow the procedure mentioned below:

  1. Find the factorization/prime factorization of the given number.
  2. Demonstrate the prime factorization of the number in the form of exponent form.
  3. Add 1 to each of the exponents of the prime factor.
  4. Now, multiply the resulting exponents together. This obtained product is equivalent to the total number of factors of the given number.

By following this procedure the total number of factors of 129 is given as:

The factorization of 129 is 1 x 3 x 43.

The exponent of 1, 3, and 43 is 1.

Adding 1 to each and multiplying them together results in 8.

Therefore, the total number of factors of 129 is 8. 4 are positive and 4 factors are negative.

Important Notes

Here are some important points that must be considered while finding the factors of any given number:

  • The factor of any given number must be a whole number.
  • The factors of the number cannot be in the form of decimals or fractions.
  • Factors can be positive as well as negative.
  • Negative factors are the additive inverse of the positive factors of a given number.
  • The factor of a number cannot be greater than that number.
  • Every even number has 2 as its prime factor which is the smallest prime factor.

Factors of 129 by Prime Factorization

The number 129 is a composite/prime number. Prime factorization is a useful technique for finding the number’s prime factors and expressing the number as the product of its prime factors.

Before finding the factors of 129 using prime factorization, let us find out what prime factors are. Prime factors are the factors of any given number that are only divisible by 1 and themselves.

To start the prime factorization of 129, start dividing by its smallest prime factor. First, determine that the given number is either even or odd. If it is an even number, then 2 will be the smallest prime factor.

Continue splitting the quotient obtained until 1 is received as the quotient. The prime factorization of 129 can be expressed as:

\[  129 = 3 \times 43\]

Factors of 129 in Pairs

The factor pairs are the duplet of numbers that when multiplied together result in the factorized number. Depending upon the total number of factors of the given numbers, factor pairs can be more than one.

For 129, the factor pairs can be found as:

\[ 1 \times 129 = 129 \]

\[ 3 \times 43 = 129 \]

The possible factor pairs of 129 are given as (1, 129) and (3, 43 ).

All these numbers in pairs, when multiplied, give 129 as the product.

The negative factor pairs of 129 are given as:

\[ -1 \times -129 = 129 \]

\[ -3 \times -43 = 129 \]

It is important to note that in negative factor pairs, the minus sign has been multiplied by the minus sign due to which the resulting product is the original positive number. Therefore, -1, -3, -43, and -129 are called negative factors of 129.

The list of all the factors of 129 including positive as well as negative numbers is given below.

Factor list of 129: 1, -1, 3, -3, 43, -43, 129, and -129

Factors of 129 Solved Examples

To better understand the concept of factors, let’s solve some examples.

Example 1

How many factors of 129 are there?

Solution

The total number of Factors of 129 is 4.

Factors of 129 are 1, 3, 43, and 129.

Example 2

Find the factors of 129 using prime factorization.

Solution

The prime factorization of 129 is given as:

\[ 129 \div 3 = 43 \]

\[ 43 \div 43 = 1 \]

So the prime factorization of 129 can be written as:

\[ 3 \times 43 = 129 \]

Factors of 128|Factors List| Factors of 130

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