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!
16139โ16141, 16187โ16189, 16229โ16231, 16361โ16363 ...
16183โ16187, 16189โ16193, 16249โ16253 ...
16097โ16103, 16217โ16223, 16223โ16229, 16267โ16273, 16333โ16339 ...
Primes of the form 2โฟ - 1 less than 16229
Primes that read the same forwards and backwards
Primes that remain prime when digits are rotated (below 16229)
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