Q: What is the prime factorization of the number 261,711?

 A:
  • The prime factors are: 3 x 3 x 3 x 3 x 3 x 3 x 359
    • or also written as { 3, 3, 3, 3, 3, 3, 359 }
  • Written in exponential form: 36 x 3591

Why is the prime factorization of 261,711 written as 36 x 3591?

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 261,711

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 261,711 by 2

261,711 ÷ 2 = 130,855.5 - This has a remainder. Let's try another prime number.
261,711 ÷ 3 = 87,237 - No remainder! 3 is one of the factors!
87,237 ÷ 3 = 29,079 - No remainder! 3 is one of the factors!
29,079 ÷ 3 = 9,693 - No remainder! 3 is one of the factors!
9,693 ÷ 3 = 3,231 - No remainder! 3 is one of the factors!
3,231 ÷ 3 = 1,077 - No remainder! 3 is one of the factors!
1,077 ÷ 3 = 359 - No remainder! 3 is one of the factors!
359 ÷ 3 = 119.6667 - There is a remainder. We can't divide by 3 evenly anymore. Let's try the next prime number
359 ÷ 5 = 71.8 - This has a remainder. 5 is not a factor.
359 ÷ 7 = 51.2857 - This has a remainder. 7 is not a factor.
359 ÷ 11 = 32.6364 - This has a remainder. 11 is not a factor.
...
Keep trying increasingly larger numbers until you find one that divides evenly.
...
359 ÷ 359 = 1 - No remainder! 359 is one of the factors!

The orange divisor(s) above are the prime factors of the number 261,711. If we put all of it together we have the factors 3 x 3 x 3 x 3 x 3 x 3 x 359 = 261,711. It can also be written in exponential form as 36 x 3591.

Factor Tree

Another way to do prime factorization is to use a factor tree. Below is a factor tree for the number 261,711.

261,711
Factor Arrows
387,237
Factor Arrows
329,079
Factor Arrows
39,693
Factor Arrows
33,231
Factor Arrows
31,077
Factor Arrows
3359

More Prime Factorization Examples

261,709261,710261,712261,713
74 x 109121 x 51 x 26,171124 x 111 x 1,4871261,7131

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