Prime Factorization Calculator
Check if a number is prime and find its factors.
Input
This tool runs entirely in your browser. The data you paste or load is never uploaded.
Result
Enter your input, then run the tool.
About this tool
Tells you whether a whole number is prime, breaks it down into prime factors with exponents, and lists the number of divisors, their sum and the nearest primes below and above. Works instantly up to a trillion.
How to use it
- Enter a whole number from 2 to 1,000,000,000,000.
- Press Factorise.
- Read the prime factors and the divisor details.
Frequently asked questions
Is 1 a prime number?
No. A prime has exactly two divisors, 1 and itself; 1 has only one.
How are divisors counted?
From the exponents: 360 = 2³ × 3² × 5, so it has (3+1) × (2+1) × (1+1) = 24 divisors.
Keep going
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