Discover if your number is Prime or Composite โ fast and easy!
โ Yes! It's a Prime Number
Prime numbers are only divisible by 1 and itself.
Explore comprehensive data about prime numbers and their fascinating properties.
Click any prime to analyze it!
857โ859, 881โ883 ...
853โ857, 859โ863, 877โ881, 883โ887, 907โ911, 937โ941, 967โ971, 1009โ1013 ...
941โ947, 947โ953, 971โ977, 977โ983, 991โ997, 1013โ1019 ...
Primes of the form 2โฟ - 1 less than 937
Primes that read the same forwards and backwards
Primes that remain prime when digits are rotated (below 937)
Prime numbers are the building blocks of mathematics, encryption, and more. Explore what makes them fascinating.
A prime number is a natural number greater than 1 that has no positive divisors other than 1
and itself.
Prime numbers cannot be formed by multiplying two smaller natural numbers. The first few are:
2, 3, 5, 7, 11, 13, 17, 19, 23...
ฯ(n) โ n/ln(n) - The density of primes decreases logarithmically
ฮถ(s) = 0 only at s = -2,-4,-6... and Re(s) = 1/2
For n > 1, there's always a prime between n and 2n
Test divisibility up to โn - Simple but slow O(โn)
Probabilistic test - Fast O(k logยณ n) with k rounds