Prime number checker
Check whether a number is prime and get its prime factors, divisors and neighbouring primes.
1 to 1,000,000,000,000
Is it prime?
No
Previous prime
359
Next prime
367
Prime factorisation
2³ × 3² × 5
Divisors (24)
1, 2, 3, 4, 5, 6, 8, 9, 10, 12, 15, 18, 20, 24, 30, 36, 40, 45, 60, 72, 90, 120, 180, 360
A prime has exactly two divisors: 1 and itself. Prime numbers set the size of a quadratic-residue diffuser.
How it works
Every whole number above 1 is either prime or a unique product of primes.
Formulas
- n is prime if no integer from 2 to √n divides it
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