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!
5417โ5419, 5441โ5443, 5477โ5479 ...
5347โ5351, 5413โ5417, 5437โ5441, 5479โ5483 ...
5297โ5303, 5303โ5309, 5381โ5387, 5387โ5393, 5393โ5399, 5407โ5413, 5431โ5437, 5443โ5449 ...
Primes of the form 2โฟ - 1 less than 5407
Primes that read the same forwards and backwards
Primes that remain prime when digits are rotated (below 5407)
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