Q: What is the prime factorization of the number 1,242,112?

 A:
  • The prime factors are: 2 x 2 x 2 x 2 x 2 x 2 x 2 x 2 x 2 x 2 x 1,213
    • or also written as { 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1,213 }
  • Written in exponential form: 210 x 1,2131

Why is the prime factorization of 1,242,112 written as 210 x 1,2131?

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 1,242,112

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 1,242,112 by 2

1,242,112 ÷ 2 = 621,056 - No remainder! 2 is one of the factors!
621,056 ÷ 2 = 310,528 - No remainder! 2 is one of the factors!
310,528 ÷ 2 = 155,264 - No remainder! 2 is one of the factors!
155,264 ÷ 2 = 77,632 - No remainder! 2 is one of the factors!
77,632 ÷ 2 = 38,816 - No remainder! 2 is one of the factors!
38,816 ÷ 2 = 19,408 - No remainder! 2 is one of the factors!
19,408 ÷ 2 = 9,704 - No remainder! 2 is one of the factors!
9,704 ÷ 2 = 4,852 - No remainder! 2 is one of the factors!
4,852 ÷ 2 = 2,426 - No remainder! 2 is one of the factors!
2,426 ÷ 2 = 1,213 - No remainder! 2 is one of the factors!
1,213 ÷ 2 = 606.5 - There is a remainder. We can't divide by 2 evenly anymore. Let's try the next prime number
1,213 ÷ 3 = 404.3333 - This has a remainder. 3 is not a factor.
1,213 ÷ 5 = 242.6 - This has a remainder. 5 is not a factor.
1,213 ÷ 7 = 173.2857 - This has a remainder. 7 is not a factor.
...
Keep trying increasingly larger numbers until you find one that divides evenly.
...
1,213 ÷ 1,213 = 1 - No remainder! 1,213 is one of the factors!

The orange divisor(s) above are the prime factors of the number 1,242,112. If we put all of it together we have the factors 2 x 2 x 2 x 2 x 2 x 2 x 2 x 2 x 2 x 2 x 1,213 = 1,242,112. It can also be written in exponential form as 210 x 1,2131.

Factor Tree

Another way to do prime factorization is to use a factor tree. Below is a factor tree for the number 1,242,112.

1,242,112
Factor Arrows
2621,056
Factor Arrows
2310,528
Factor Arrows
2155,264
Factor Arrows
277,632
Factor Arrows
238,816
Factor Arrows
219,408
Factor Arrows
29,704
Factor Arrows
24,852
Factor Arrows
22,426
Factor Arrows
21,213

More Prime Factorization Examples

1,242,1101,242,1111,242,1131,242,114
21 x 51 x 2231 x 557131 x 131 x 31,8491671 x 18,539121 x 31 x 2411 x 8591

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