Q: What is the prime factorization of the number 25,237,181?

 A:
  • The prime factors are: 41 x 137 x 4,493
    • or also written as { 41, 137, 4,493 }
  • Written in exponential form: 411 x 1371 x 4,4931

Why is the prime factorization of 25,237,181 written as 411 x 1371 x 4,4931?

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 25,237,181

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 25,237,181 by 2

25,237,181 ÷ 2 = 12,618,590.5 - This has a remainder. Let's try another prime number.
25,237,181 ÷ 3 = 8,412,393.6667 - This has a remainder. Let's try another prime number.
25,237,181 ÷ 5 = 5,047,436.2 - This has a remainder. Let's try another prime number.
...
Keep trying increasingly larger numbers until you find one that divides evenly.
...
25,237,181 ÷ 41 = 615,541 - No remainder! 41 is one of the factors!
615,541 ÷ 41 = 15,013.1951 - There is a remainder. We can't divide by 41 evenly anymore. Let's try the next prime number
615,541 ÷ 43 = 14,314.907 - This has a remainder. 43 is not a factor.
615,541 ÷ 47 = 13,096.617 - This has a remainder. 47 is not a factor.
615,541 ÷ 53 = 11,613.9811 - This has a remainder. 53 is not a factor.
...
Keep trying increasingly larger numbers until you find one that divides evenly.
...
615,541 ÷ 137 = 4,493 - No remainder! 137 is one of the factors!
4,493 ÷ 137 = 32.7956 - There is a remainder. We can't divide by 137 evenly anymore. Let's try the next prime number
4,493 ÷ 139 = 32.3237 - This has a remainder. 139 is not a factor.
4,493 ÷ 149 = 30.1544 - This has a remainder. 149 is not a factor.
4,493 ÷ 151 = 29.755 - This has a remainder. 151 is not a factor.
...
Keep trying increasingly larger numbers until you find one that divides evenly.
...
4,493 ÷ 4,493 = 1 - No remainder! 4,493 is one of the factors!

The orange divisor(s) above are the prime factors of the number 25,237,181. If we put all of it together we have the factors 41 x 137 x 4,493 = 25,237,181. It can also be written in exponential form as 411 x 1371 x 4,4931.

Factor Tree

Another way to do prime factorization is to use a factor tree. Below is a factor tree for the number 25,237,181.

25,237,181
Factor Arrows
41615,541
Factor Arrows
1374,493

More Prime Factorization Examples

25,237,17925,237,18025,237,18225,237,183
32 x 111 x 2271 x 1,123122 x 51 x 171 x 1991 x 373121 x 31 x 371 x 791 x 1,43913,6731 x 6,8711

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