Checks whether a number is prime using an optimised primality test. Also generates all prime numbers within a specified range using the Sieve of Eratosthenes, finds the next prime after a given number, finds the nearest twin primes, and factorises composite numbers into their prime factors.
Enter a number to check if it's prime, find its factors, or generate all primes in a range. For GCD and LCM calculations using those factors, use the GCD & LCM Calculator.
Check prime
Input
97
Output
Prime ✓ (11th prime, next prime: 101)
Calculate the Greatest Common Divisor and Least Common Multiple.
Generate Fibonacci sequences up to N terms or up to a maximum value.
Calculate mean, median, mode, standard deviation, and more from a dataset.
Convert numbers between binary, octal, decimal, and hexadecimal.
Convert between length, weight, temperature, volume, area, and more.
Format numbers with locale-specific separators, currency, and scientific notation.