Q: What are the prime factors of the number 124,557,312?

 A: 2, 3, 11, 19, 97

Why are those the prime factors of the number 124,557,312?

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 124,557,312

124,557,312
Factor Arrows
262,278,656
Factor Arrows
231,139,328
Factor Arrows
215,569,664
Factor Arrows
27,784,832
Factor Arrows
23,892,416
Factor Arrows
21,946,208
Factor Arrows
2973,104
Factor Arrows
2486,552
Factor Arrows
2243,276
Factor Arrows
2121,638
Factor Arrows
260,819
Factor Arrows
320,273
Factor Arrows
111,843
Factor Arrows
1997

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, 11, 19, 97

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 2 x 2 x 2 x 3 x 11 x 19 x 97 = 124,557,312

This can also be written as 211 x 31 x 111 x 191 x 971 = 124,557,312

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


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