Q: What is the prime factorization of the number 331,310,135?

 A:
  • The prime factors are: 5 x 13 x 13 x 41 x 73 x 131
    • or also written as { 5, 13, 13, 41, 73, 131 }
  • Written in exponential form: 51 x 132 x 411 x 731 x 1311

Why is the prime factorization of 331,310,135 written as 51 x 132 x 411 x 731 x 1311?

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 331,310,135

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 331,310,135 by 2

331,310,135 ÷ 2 = 165,655,067.5 - This has a remainder. Let's try another prime number.
331,310,135 ÷ 3 = 110,436,711.6667 - This has a remainder. Let's try another prime number.
331,310,135 ÷ 5 = 66,262,027 - No remainder! 5 is one of the factors!
66,262,027 ÷ 5 = 13,252,405.4 - There is a remainder. We can't divide by 5 evenly anymore. Let's try the next prime number
66,262,027 ÷ 7 = 9,466,003.8571 - This has a remainder. 7 is not a factor.
66,262,027 ÷ 11 = 6,023,820.6364 - This has a remainder. 11 is not a factor.
66,262,027 ÷ 13 = 5,097,079 - No remainder! 13 is one of the factors!
5,097,079 ÷ 13 = 392,083 - No remainder! 13 is one of the factors!
392,083 ÷ 13 = 30,160.2308 - There is a remainder. We can't divide by 13 evenly anymore. Let's try the next prime number
392,083 ÷ 17 = 23,063.7059 - This has a remainder. 17 is not a factor.
392,083 ÷ 19 = 20,635.9474 - This has a remainder. 19 is not a factor.
392,083 ÷ 23 = 17,047.087 - This has a remainder. 23 is not a factor.
...
Keep trying increasingly larger numbers until you find one that divides evenly.
...
392,083 ÷ 41 = 9,563 - No remainder! 41 is one of the factors!
9,563 ÷ 41 = 233.2439 - There is a remainder. We can't divide by 41 evenly anymore. Let's try the next prime number
9,563 ÷ 43 = 222.3953 - This has a remainder. 43 is not a factor.
9,563 ÷ 47 = 203.4681 - This has a remainder. 47 is not a factor.
9,563 ÷ 53 = 180.434 - This has a remainder. 53 is not a factor.
...
Keep trying increasingly larger numbers until you find one that divides evenly.
...
9,563 ÷ 73 = 131 - No remainder! 73 is one of the factors!
131 ÷ 73 = 1.7945 - There is a remainder. We can't divide by 73 evenly anymore. Let's try the next prime number
131 ÷ 79 = 1.6582 - This has a remainder. 79 is not a factor.
131 ÷ 83 = 1.5783 - This has a remainder. 83 is not a factor.
131 ÷ 89 = 1.4719 - This has a remainder. 89 is not a factor.
...
Keep trying increasingly larger numbers until you find one that divides evenly.
...
131 ÷ 131 = 1 - No remainder! 131 is one of the factors!

The orange divisor(s) above are the prime factors of the number 331,310,135. If we put all of it together we have the factors 5 x 13 x 13 x 41 x 73 x 131 = 331,310,135. It can also be written in exponential form as 51 x 132 x 411 x 731 x 1311.

Factor Tree

Another way to do prime factorization is to use a factor tree. Below is a factor tree for the number 331,310,135.

331,310,135
Factor Arrows
566,262,027
Factor Arrows
135,097,079
Factor Arrows
13392,083
Factor Arrows
419,563
Factor Arrows
73131

More Prime Factorization Examples

331,310,133331,310,134331,310,136331,310,137
32 x 71 x 111 x 3891 x 1,229121 x 591 x 7571 x 3,709123 x 31 x 371 x 5091 x 73311,4931 x 221,9091

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