Q: What is the prime factorization of the number 149,047?

 A:
  • The prime factors are: 113 x 1,319
    • or also written as { 113, 1,319 }
  • Written in exponential form: 1131 x 1,3191

Why is the prime factorization of 149,047 written as 1131 x 1,3191?

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 149,047

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 149,047 by 2

149,047 ÷ 2 = 74,523.5 - This has a remainder. Let's try another prime number.
149,047 ÷ 3 = 49,682.3333 - This has a remainder. Let's try another prime number.
149,047 ÷ 5 = 29,809.4 - This has a remainder. Let's try another prime number.
...
Keep trying increasingly larger numbers until you find one that divides evenly.
...
149,047 ÷ 113 = 1,319 - No remainder! 113 is one of the factors!
1,319 ÷ 113 = 11.6726 - There is a remainder. We can't divide by 113 evenly anymore. Let's try the next prime number
1,319 ÷ 127 = 10.3858 - This has a remainder. 127 is not a factor.
1,319 ÷ 131 = 10.0687 - This has a remainder. 131 is not a factor.
1,319 ÷ 137 = 9.6277 - This has a remainder. 137 is not a factor.
...
Keep trying increasingly larger numbers until you find one that divides evenly.
...
1,319 ÷ 1,319 = 1 - No remainder! 1,319 is one of the factors!

The orange divisor(s) above are the prime factors of the number 149,047. If we put all of it together we have the factors 113 x 1,319 = 149,047. It can also be written in exponential form as 1131 x 1,3191.

Factor Tree

Another way to do prime factorization is to use a factor tree. Below is a factor tree for the number 149,047.

149,047
Factor Arrows
1131,319

More Prime Factorization Examples

149,045149,046149,048149,049
51 x 131 x 2,293121 x 31 x 24,841123 x 311 x 601132 x 16,5611

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