Q: What is the prime factorization of the number 115,415,507?

Why is the prime factorization of 115,415,507 written as 10,499¹ x 10,993¹?

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 115,415,507

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.

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

Let's start by dividing 115,415,507 by 2

115,415,507 ÷ 2 = 57,707,753.5 - This has a remainder. Let's try another prime number.
115,415,507 ÷ 3 = 38,471,835.6667 - This has a remainder. Let's try another prime number.
115,415,507 ÷ 5 = 23,083,101.4 - This has a remainder. Let's try another prime number.
...
Keep trying increasingly larger numbers until you find one that divides evenly.
...
115,415,507 ÷ 10,499 = 10,993 - No remainder! 10,499 is one of the factors!
10,993 ÷ 10,499 = 1.0471 - There is a remainder. We can't divide by 10499 evenly anymore. Let's try the next prime number
10,993 ÷ 10,501 = 1.0469 - This has a remainder. 10,501 is not a factor.
10,993 ÷ 10,513 = 1.0457 - This has a remainder. 10,513 is not a factor.
10,993 ÷ 10,529 = 1.0441 - This has a remainder. 10,529 is not a factor.
...
Keep trying increasingly larger numbers until you find one that divides evenly.
...
10,993 ÷ 10,993 = 1 - No remainder! 10,993 is one of the factors!

The orange divisor(s) above are the prime factors of the number 115,415,507. If we put all of it together we have the factors 10,499 x 10,993 = 115,415,507. It can also be written in exponential form as 10,499¹ x 10,993¹.

Factor Tree

Another way to do prime factorization is to use a factor tree. Below is a factor tree for the number 115,415,507.

	115,415,507
10,499		10,993

More Prime Factorization Examples

Try the factor calculator