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!
4721โ4723, 4787โ4789, 4799โ4801 ...
4729โ4733, 4783โ4787, 4789โ4793, 4813โ4817 ...
4657โ4663, 4673โ4679, 4723โ4729, 4793โ4799, 4871โ4877 ...
Primes of the form 2โฟ - 1 less than 4783
Primes that read the same forwards and backwards
Primes that remain prime when digits are rotated (below 4783)
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