Q: What are the prime factors of the number 31,533,312?

 A: 2, 3, 19, 2161

Why are those the prime factors of the number 31,533,312?

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 31,533,312

31,533,312
Factor Arrows
215,766,656
Factor Arrows
27,883,328
Factor Arrows
23,941,664
Factor Arrows
21,970,832
Factor Arrows
2985,416
Factor Arrows
2492,708
Factor Arrows
2246,354
Factor Arrows
2123,177
Factor Arrows
341,059
Factor Arrows
192,161

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:

2, 3, 19, 2161

We can check our work by multiplying all of the prime factors together: 2 x 2 x 2 x 2 x 2 x 2 x 2 x 2 x 3 x 19 x 2,161 = 31,533,312

This can also be written as 28 x 31 x 191 x 2,1611 = 31,533,312

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


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