Prime Number Checker
Test integers up to 10¹⁸ with deterministic Miller–Rabin, inspect nearest primes, optional factorisation, and divisor statistics for deeper number theory insights.
Supports negative numbers (primality applies to the absolute value). Use underscores or prefixes (0x, 0b) if you prefer.
Find nearest primes
Quickly locate the next and previous primes.
Show factorisation
Enabled for numbers up to 100,000,000.
Prime status
Prime
No divisors other than 1 and itself
Parity
Odd
Absolute value has 2 digits
Binary length
7 bits
Digits needed in base 2
Absolute value
97
Checking primality on |n|
Nearest primes
Previous prime
89
Gap: 8
Next prime
101
Gap: 4
Prime factorisation
1 factors
97
Divisors
2
Total number of positive divisors
Sum of divisors
98
σ(n) including 1 and itself