Factors of 123: Prime Factorization, Methods, and Examples

The factors are the numbers that can divide any given number wholly. The factors of 123 are the list of natural numbers that completely divide it without leaving any remainder behind. The factors of 123 can be positive or negative.

Factors Of 123

Factors of 123

Here are the factors of number 123.

Factors of 123: 1, 3, 41, 123

Negative Factors of 123

The negative factors of 123 are similar to its positive factors, just with a negative sign.

Negative Factors of 123: -1, -3, -41, and -123

Prime Factorization of 123

The prime factorization of 123 is the way of expressing its prime factors in the product form.

Prime Factorization: 3 x 41

In this article, we will learn about the factors of 123 and how to find them using various techniques such as upside-down division, prime factorization, and factor tree.

What Are the Factors of 123?

The factors of 123 are 1, 3, 41, and 123. All of these numbers are the factors as they do not leave any remainder when divided by 123.

The factors of 123 are classified as prime numbers and composite numbers. The prime factors of the number 123 can be determined using the technique of prime factorization.

How To Find the Factors of 123?

You can find the factors of 123 by using the rules of divisibility. The rule of divisibility states that any number when divided by any other natural number then it 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 123, create a list containing the numbers that are exactly divisible by 123 with zero remainders. One important thing to note is that 1 and 123 are the 123’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 123 are determined as follows:

\[\dfrac{123}{1} = 123\]

\[\dfrac{123}{3} = 41\]

\[\dfrac{123}{41} = 3\]

\[\dfrac{123}{123} = 1\]

Therefore, 1, 3, 41, and 123 are the factors of 123.

Total Number of Factors of 123

For 123 there are 4 positive factors and 4 negative ones. So in total, there are 8 factors of 123. 

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 123 is given as:

Factorization of 123 is 1 x 3 x 41.

The exponent of 1, 3, and 41 is 1.

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

Therefore, the total number of factors of 123 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 123 by Prime Factorization

The number 123 is a composite. Prime factorization is a useful technique for finding the number’s prime factors and expressing the number as the product of its prime factors.prime factorization of 123

Before finding the factors of 123 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 123, 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 123 can be expressed as:

123 = 3 x 41

Factors of 123 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.Pairs of 123

For 123, the factor pairs can be found as:

1 x 123 = 123

3 x 41 = 123

The possible factor pairs of 123 are given as (1, 123) and(3, 41).

All these numbers in pairs, when multiplied, give 123 as the product.

The negative factor pairs of 123 are given as:

-1 x -123 = 123

 -3 x -41 = 123

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, -41, and -123 are called negative factors of 123.

The list of all the factors of 123 including positive as well as negative numbers is given below.

Factor list of 123: 1, -1, 3, -3, 41, -41, 123, and -123

Factors of 123 Solved Examples

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

Example 1

How many factors of 123 are there?


The total number of Factors of 123 is 4.

Factors of 123 are 1, 3, 41, and 123.

Example 2

Find the factors of 123 using prime factorization.


The prime factorization of 123 is given as:

123 $\div$ 3 = 41

41 $\div$ 41 = 1 

So the prime factorization of 123 can be written as:

 3 x 41 = 123

Factors of 122|Factors List| Factors of 124