Q: What is the prime factorization of the number 45,147,025?

 A:
  • The prime factors are: 5 x 5 x 7 x 11 x 47 x 499
    • or also written as { 5, 5, 7, 11, 47, 499 }
  • Written in exponential form: 52 x 71 x 111 x 471 x 4991

Why is the prime factorization of 45,147,025 written as 52 x 71 x 111 x 471 x 4991?

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 45,147,025

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 45,147,025 by 2

45,147,025 ÷ 2 = 22,573,512.5 - This has a remainder. Let's try another prime number.
45,147,025 ÷ 3 = 15,049,008.3333 - This has a remainder. Let's try another prime number.
45,147,025 ÷ 5 = 9,029,405 - No remainder! 5 is one of the factors!
9,029,405 ÷ 5 = 1,805,881 - No remainder! 5 is one of the factors!
1,805,881 ÷ 5 = 361,176.2 - There is a remainder. We can't divide by 5 evenly anymore. Let's try the next prime number
1,805,881 ÷ 7 = 257,983 - No remainder! 7 is one of the factors!
257,983 ÷ 7 = 36,854.7143 - There is a remainder. We can't divide by 7 evenly anymore. Let's try the next prime number
257,983 ÷ 11 = 23,453 - No remainder! 11 is one of the factors!
23,453 ÷ 11 = 2,132.0909 - There is a remainder. We can't divide by 11 evenly anymore. Let's try the next prime number
23,453 ÷ 13 = 1,804.0769 - This has a remainder. 13 is not a factor.
23,453 ÷ 17 = 1,379.5882 - This has a remainder. 17 is not a factor.
23,453 ÷ 19 = 1,234.3684 - This has a remainder. 19 is not a factor.
...
Keep trying increasingly larger numbers until you find one that divides evenly.
...
23,453 ÷ 47 = 499 - No remainder! 47 is one of the factors!
499 ÷ 47 = 10.617 - There is a remainder. We can't divide by 47 evenly anymore. Let's try the next prime number
499 ÷ 53 = 9.4151 - This has a remainder. 53 is not a factor.
499 ÷ 59 = 8.4576 - This has a remainder. 59 is not a factor.
499 ÷ 61 = 8.1803 - This has a remainder. 61 is not a factor.
...
Keep trying increasingly larger numbers until you find one that divides evenly.
...
499 ÷ 499 = 1 - No remainder! 499 is one of the factors!

The orange divisor(s) above are the prime factors of the number 45,147,025. If we put all of it together we have the factors 5 x 5 x 7 x 11 x 47 x 499 = 45,147,025. It can also be written in exponential form as 52 x 71 x 111 x 471 x 4991.

Factor Tree

Another way to do prime factorization is to use a factor tree. Below is a factor tree for the number 45,147,025.

45,147,025
Factor Arrows
59,029,405
Factor Arrows
51,805,881
Factor Arrows
7257,983
Factor Arrows
1123,453
Factor Arrows
47499

More Prime Factorization Examples

45,147,02345,147,02445,147,02645,147,027
3,5391 x 12,757124 x 33 x 131 x 8,039121 x 291 x 778,397131 x 411 x 367,0491

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