Q: What are the prime factors of the number 1,217,766?

 A: 2, 3, 11, 18451

Why are those the prime factors of the number 1,217,766?

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 1,217,766

1,217,766
Factor Arrows
2608,883
Factor Arrows
3202,961
Factor Arrows
1118,451

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, 18451

We can check our work by multiplying all of the prime factors together: 2 x 3 x 11 x 18,451 = 1,217,766

This can also be written as 21 x 31 x 111 x 18,4511 = 1,217,766

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


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