🔢
Calculators
Prime Number Checker
Check if a number is prime. Shows the prime factorization, the previous prime and the next prime. Instant result.
Prime factorization
Previous prime
Next prime
What is a prime number?
A prime number is a natural number greater than 1 that is only divisible by 1 and itself. The first primes are: 2, 3, 5, 7, 11, 13, 17, 19, 23… The number 1 is not considered prime by definition.
Related Tools
Ⅻ
Roman Numerals Converter
Convert Arabic numbers to Roman numerals and vice versa. Supports values from 1 to 3999. Instant bidirectional conversion.
➗
GCD Calculator
Calculate the Greatest Common Divisor (GCD) of two or more numbers using the Euclidean algorithm. Instant result.
✖️
LCM Calculator
Calculate the Least Common Multiple (LCM) of two or more numbers. Instant result in the browser.