Q: What is the prime factorization of the number 102,531?

 A:
  • The prime factors are: 3 x 11 x 13 x 239
    • or also written as { 3, 11, 13, 239 }
  • Written in exponential form: 31 x 111 x 131 x 2391

Why is the prime factorization of 102,531 written as 31 x 111 x 131 x 2391?

What is prime factorization?

Prime factorization or prime factor decomposition is the process of finding which prime numbers can be multiplied together to make the original number.

Finding the prime factors of 102,531

To find the prime factors, you start by dividing the number by the first prime number, which is 2. If there is not a remainder, meaning you can divide evenly, then 2 is a factor of the number. Continue dividing by 2 until you cannot divide evenly anymore. Write down how many 2's you were able to divide by evenly. Now try dividing by the next prime factor, which is 3. The goal is to get to a quotient of 1.

If it doesn't make sense yet, let's try it...

Here are the first several prime factors: 2, 3, 5, 7, 11, 13, 17, 19, 23, 29...

Let's start by dividing 102,531 by 2

102,531 ÷ 2 = 51,265.5 - This has a remainder. Let's try another prime number.
102,531 ÷ 3 = 34,177 - No remainder! 3 is one of the factors!
34,177 ÷ 3 = 11,392.3333 - There is a remainder. We can't divide by 3 evenly anymore. Let's try the next prime number
34,177 ÷ 5 = 6,835.4 - This has a remainder. 5 is not a factor.
34,177 ÷ 7 = 4,882.4286 - This has a remainder. 7 is not a factor.
34,177 ÷ 11 = 3,107 - No remainder! 11 is one of the factors!
3,107 ÷ 11 = 282.4545 - There is a remainder. We can't divide by 11 evenly anymore. Let's try the next prime number
3,107 ÷ 13 = 239 - No remainder! 13 is one of the factors!
239 ÷ 13 = 18.3846 - There is a remainder. We can't divide by 13 evenly anymore. Let's try the next prime number
239 ÷ 17 = 14.0588 - This has a remainder. 17 is not a factor.
239 ÷ 19 = 12.5789 - This has a remainder. 19 is not a factor.
239 ÷ 23 = 10.3913 - This has a remainder. 23 is not a factor.
...
Keep trying increasingly larger numbers until you find one that divides evenly.
...
239 ÷ 239 = 1 - No remainder! 239 is one of the factors!

The orange divisor(s) above are the prime factors of the number 102,531. If we put all of it together we have the factors 3 x 11 x 13 x 239 = 102,531. It can also be written in exponential form as 31 x 111 x 131 x 2391.

Factor Tree

Another way to do prime factorization is to use a factor tree. Below is a factor tree for the number 102,531.

102,531
Factor Arrows
334,177
Factor Arrows
113,107
Factor Arrows
13239

More Prime Factorization Examples

102,529102,530102,532102,533
71 x 971 x 151121 x 51 x 10,253122 x 25,6331102,5331

Try the factor calculator

Explore more about the number 102,531:


Ask a Question