Q: What is the prime factorization of the number 1,184,625?

 A:
  • The prime factors are: 3 x 3 x 3 x 3 x 3 x 3 x 5 x 5 x 5 x 13
    • or also written as { 3, 3, 3, 3, 3, 3, 5, 5, 5, 13 }
  • Written in exponential form: 36 x 53 x 131

Why is the prime factorization of 1,184,625 written as 36 x 53 x 131?

What is prime factorization?

Prime factorization or prime factor decomposition is the process of finding which prime numbers can be multiplied together to make the original number.

Finding the prime factors of 1,184,625

To find the prime factors, you start by dividing the number by the first prime number, which is 2. If there is not a remainder, meaning you can divide evenly, then 2 is a factor of the number. Continue dividing by 2 until you cannot divide evenly anymore. Write down how many 2's you were able to divide by evenly. Now try dividing by the next prime factor, which is 3. The goal is to get to a quotient of 1.

If it doesn't make sense yet, let's try it...

Here are the first several prime factors: 2, 3, 5, 7, 11, 13, 17, 19, 23, 29...

Let's start by dividing 1,184,625 by 2

1,184,625 ÷ 2 = 592,312.5 - This has a remainder. Let's try another prime number.
1,184,625 ÷ 3 = 394,875 - No remainder! 3 is one of the factors!
394,875 ÷ 3 = 131,625 - No remainder! 3 is one of the factors!
131,625 ÷ 3 = 43,875 - No remainder! 3 is one of the factors!
43,875 ÷ 3 = 14,625 - No remainder! 3 is one of the factors!
14,625 ÷ 3 = 4,875 - No remainder! 3 is one of the factors!
4,875 ÷ 3 = 1,625 - No remainder! 3 is one of the factors!
1,625 ÷ 3 = 541.6667 - There is a remainder. We can't divide by 3 evenly anymore. Let's try the next prime number
1,625 ÷ 5 = 325 - No remainder! 5 is one of the factors!
325 ÷ 5 = 65 - No remainder! 5 is one of the factors!
65 ÷ 5 = 13 - No remainder! 5 is one of the factors!
13 ÷ 5 = 2.6 - There is a remainder. We can't divide by 5 evenly anymore. Let's try the next prime number
13 ÷ 7 = 1.8571 - This has a remainder. 7 is not a factor.
13 ÷ 11 = 1.1818 - This has a remainder. 11 is not a factor.
13 ÷ 13 = 1 - No remainder! 13 is one of the factors!

The orange divisor(s) above are the prime factors of the number 1,184,625. If we put all of it together we have the factors 3 x 3 x 3 x 3 x 3 x 3 x 5 x 5 x 5 x 13 = 1,184,625. It can also be written in exponential form as 36 x 53 x 131.

Factor Tree

Another way to do prime factorization is to use a factor tree. Below is a factor tree for the number 1,184,625.

1,184,625
Factor Arrows
3394,875
Factor Arrows
3131,625
Factor Arrows
343,875
Factor Arrows
314,625
Factor Arrows
34,875
Factor Arrows
31,625
Factor Arrows
5325
Factor Arrows
565
Factor Arrows
513

More Prime Factorization Examples

1,184,6231,184,6241,184,6261,184,627
111 x 107,693124 x 72 x 1,511121 x 4991 x 1,1871671 x 17,6811

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