Q: What are the prime factors of the number 16,321,275?

 A: 3, 5, 17, 251

Why are those the prime factors of the number 16,321,275?

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 16,321,275

16,321,275
Factor Arrows
35,440,425
Factor Arrows
31,813,475
Factor Arrows
5362,695
Factor Arrows
572,539
Factor Arrows
174,267
Factor Arrows
17251

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:

3, 5, 17, 251

We can check our work by multiplying all of the prime factors together: 3 x 3 x 5 x 5 x 17 x 17 x 251 = 16,321,275

This can also be written as 32 x 52 x 172 x 2511 = 16,321,275

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


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