Prime Factorization Calculator: Enter a number and this calculator will calculate its primfactorization as well as determine if the number is prime or not.

Type in whatever number you want and then choose which operation you want the prime factorization calculator to perform.

The prime factorization calculator can

Calculate the prime factorization of the number you type (Numbers above 10 million may or may not time out. Calculating the prime factorization of large numbers is not easy, but the calculator can handle pretty darn big ones!)
Determine whether or not a number is prime
Create sieve of Erasthones for the number
Create a list of all positive prime numbers smaller than the number of your choice.

As an example, if you want the calculator to determine how many primes are before the number 11, just type in the number 11, then select "List of Primes before" and the it will promptly output '5' (The 5 positive primes smaller than the number 11 are 2, 3, 5,7 and 11).

As an example, if you want the prime factorization calculator to determine how many primes are before the number 11, just type in the number 11, then select and the calculator will promptly create a list of the numbers 2, 3, 5 and 7.

Number factored most often at site: 12 at 8,755 factorizations!

Total factorizations to date: 1,357,885

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