Q: What are the prime factors of the number 515,431?

 A: 7, 67, 157

Why are those the prime factors of the number 515,431?

Prime factors are the prime numbers that can be multipled together to equal the original number. You find the factors by dividing by prime numbers. It is best shown by creating a Factor Tree.

Factor Tree for the number 515,431

515,431
Factor Arrows
773,633
Factor Arrows
710,519
Factor Arrows
67157

The numbers in bold above are the prime factors. If there are multiples, you only count them one time. This leads us to our prime factors of:

7, 67, 157

We can check our work by multiplying all of the prime factors together: 7 x 7 x 67 x 157 = 515,431

This can also be written as 72 x 671 x 1571 = 515,431

If you would like to know more, or need additional explanation, please review our prime factorization explanation.


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