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!
9239โ9241, 9281โ9283, 9341โ9343 ...
9199โ9203, 9277โ9281, 9319โ9323, 9337โ9341 ...
9181โ9187, 9203โ9209, 9221โ9227, 9343โ9349, 9371โ9377, 9391โ9397 ...
Primes of the form 2โฟ - 1 less than 9283
Primes that read the same forwards and backwards
Primes that remain prime when digits are rotated (below 9283)
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