Q: What is the prime factorization of the number 1,234,567?

 A:
  • The prime factors are: 127 x 9,721
    • or also written as { 127, 9,721 }
  • Written in exponential form: 1271 x 9,7211

Why is the prime factorization of 1,234,567 written as 1271 x 9,7211?

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 1,234,567

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 1,234,567 by 2

1,234,567 ÷ 2 = 617,283.5 - This has a remainder. Let's try another prime number.
1,234,567 ÷ 3 = 411,522.3333 - This has a remainder. Let's try another prime number.
1,234,567 ÷ 5 = 246,913.4 - This has a remainder. Let's try another prime number.
...
Keep trying increasingly larger numbers until you find one that divides evenly.
...
1,234,567 ÷ 127 = 9,721 - No remainder! 127 is one of the factors!
9,721 ÷ 127 = 76.5433 - There is a remainder. We can't divide by 127 evenly anymore. Let's try the next prime number
9,721 ÷ 131 = 74.2061 - This has a remainder. 131 is not a factor.
9,721 ÷ 137 = 70.9562 - This has a remainder. 137 is not a factor.
9,721 ÷ 139 = 69.9353 - This has a remainder. 139 is not a factor.
...
Keep trying increasingly larger numbers until you find one that divides evenly.
...
9,721 ÷ 9,721 = 1 - No remainder! 9,721 is one of the factors!

The orange divisor(s) above are the prime factors of the number 1,234,567. If we put all of it together we have the factors 127 x 9,721 = 1,234,567. It can also be written in exponential form as 1271 x 9,7211.

Factor Tree

Another way to do prime factorization is to use a factor tree. Below is a factor tree for the number 1,234,567.

1,234,567
Factor Arrows
1279,721

More Prime Factorization Examples

1,234,5651,234,5661,234,5681,234,569
51 x 246,913121 x 32 x 1071 x 641123 x 154,321131 x 71 x 58,7891

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