Why is the prime factorization of 31,334,240 written as 25 x 51 x 71 x 1011 x 2771?
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 31,334,240
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 31,334,240 by 2
31,334,240 ÷ 2 = 15,667,120 - No remainder! 2 is one of the factors!
15,667,120 ÷ 2 = 7,833,560 - No remainder! 2 is one of the factors!
7,833,560 ÷ 2 = 3,916,780 - No remainder! 2 is one of the factors!
3,916,780 ÷ 2 = 1,958,390 - No remainder! 2 is one of the factors!
1,958,390 ÷ 2 = 979,195 - No remainder! 2 is one of the factors!
979,195 ÷ 2 = 489,597.5 - There is a remainder. We can't divide by 2 evenly anymore. Let's try the next prime number
979,195 ÷ 3 = 326,398.3333 - This has a remainder. 3 is not a factor.
979,195 ÷ 5 = 195,839 - No remainder! 5 is one of the factors!
195,839 ÷ 5 = 39,167.8 - There is a remainder. We can't divide by 5 evenly anymore. Let's try the next prime number
195,839 ÷ 7 = 27,977 - No remainder! 7 is one of the factors!
27,977 ÷ 7 = 3,996.7143 - There is a remainder. We can't divide by 7 evenly anymore. Let's try the next prime number
27,977 ÷ 11 = 2,543.3636 - This has a remainder. 11 is not a factor.
27,977 ÷ 13 = 2,152.0769 - This has a remainder. 13 is not a factor.
27,977 ÷ 17 = 1,645.7059 - This has a remainder. 17 is not a factor.
...
Keep trying increasingly larger numbers until you find one that divides evenly.
...
27,977 ÷ 101 = 277 - No remainder! 101 is one of the factors!
277 ÷ 101 = 2.7426 - There is a remainder. We can't divide by 101 evenly anymore. Let's try the next prime number
277 ÷ 103 = 2.6893 - This has a remainder. 103 is not a factor.
277 ÷ 107 = 2.5888 - This has a remainder. 107 is not a factor.
277 ÷ 109 = 2.5413 - This has a remainder. 109 is not a factor.
...
Keep trying increasingly larger numbers until you find one that divides evenly.
...
277 ÷ 277 = 1 - No remainder! 277 is one of the factors!
The orange divisor(s) above are the prime factors of the number 31,334,240. If we put all of it together we have the factors 2 x 2 x 2 x 2 x 2 x 5 x 7 x 101 x 277 = 31,334,240. It can also be written in exponential form as 25 x 51 x 71 x 1011 x 2771.
Factor Tree
Another way to do prime factorization is to use a factor tree. Below is a factor tree for the number 31,334,240.
| 31,334,240 | | | | | | | | |
| ![Factor Arrows](/assets/img/factor-arrows.png) | | | | | | | | |
2 | | 15,667,120 | | | | | | | |
| | ![Factor Arrows](/assets/img/factor-arrows.png) | | | | | | | |
| 2 | | 7,833,560 | | | | | | |
| | | ![Factor Arrows](/assets/img/factor-arrows.png) | | | | | | |
| | 2 | | 3,916,780 | | | | | |
| | | | ![Factor Arrows](/assets/img/factor-arrows.png) | | | | | |
| | | 2 | | 1,958,390 | | | | |
| | | | | ![Factor Arrows](/assets/img/factor-arrows.png) | | | | |
| | | | 2 | | 979,195 | | | |
| | | | | | ![Factor Arrows](/assets/img/factor-arrows.png) | | | |
| | | | | 5 | | 195,839 | | |
| | | | | | | ![Factor Arrows](/assets/img/factor-arrows.png) | | |
| | | | | | 7 | | 27,977 | |
| | | | | | | | ![Factor Arrows](/assets/img/factor-arrows.png) | |
| | | | | | | 101 | | 277 |
More Prime Factorization Examples
31,334,238 | 31,334,239 | 31,334,241 | 31,334,242 |
21 x 32 x 131 x 3591 x 3731 | 291 x 1,080,4911 | 31 x 9291 x 11,2431 | 21 x 311 x 471 x 10,7531 |
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