Q: What is the prime factorization of the number 231,121,763?

Why is the prime factorization of 231,121,763 written as 1,823¹ x 126,781¹?

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 231,121,763

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 231,121,763 by 2

231,121,763 ÷ 2 = 115,560,881.5 - This has a remainder. Let's try another prime number.
231,121,763 ÷ 3 = 77,040,587.6667 - This has a remainder. Let's try another prime number.
231,121,763 ÷ 5 = 46,224,352.6 - This has a remainder. Let's try another prime number.
...
Keep trying increasingly larger numbers until you find one that divides evenly.
...
231,121,763 ÷ 1,823 = 126,781 - No remainder! 1,823 is one of the factors!
126,781 ÷ 1,823 = 69.5453 - There is a remainder. We can't divide by 1823 evenly anymore. Let's try the next prime number
126,781 ÷ 1,831 = 69.2414 - This has a remainder. 1,831 is not a factor.
126,781 ÷ 1,847 = 68.6416 - This has a remainder. 1,847 is not a factor.
126,781 ÷ 1,861 = 68.1252 - This has a remainder. 1,861 is not a factor.
...
Keep trying increasingly larger numbers until you find one that divides evenly.
...
126,781 ÷ 126,781 = 1 - No remainder! 126,781 is one of the factors!

The orange divisor(s) above are the prime factors of the number 231,121,763. If we put all of it together we have the factors 1,823 x 126,781 = 231,121,763. It can also be written in exponential form as 1,823¹ x 126,781¹.

Factor Tree

Another way to do prime factorization is to use a factor tree. Below is a factor tree for the number 231,121,763.

	231,121,763
1,823		126,781

More Prime Factorization Examples

Try the factor calculator