Check if any number is prime. Also shows all factors and whether the number is odd or even. Everything runs locally in your browser — nothing is uploaded.
Find the prime factors of any number. Shows the complete factorization tree and exponential form. Everything runs locally in your browser — nothing is uploaded.
Find the ISO week number for any date. Also shows the day of the week and the current week of the year. Everything runs locally in your browser — nothing is uploaded.
Calculate the number of ways to arrange k items from n items (nPr). Shows the step-by-step permutation calculation. Everything runs locally in your browser — nothing is uploaded.
Generates random integers or decimals within a user-defined min-max range with optional repetition filtering. Uses the browser random number generator — fine for games, raffles, and sampling, not for security secrets. Everything runs locally in your browser — nothing is uploaded.
Determines the exact unit volume or revenue required to cover fixed and variable costs, with a built-in sensitivity slider for price changes. Essential for startup pricing strategy, product launch planning, and manufacturing cost analysis where knowing your break-even point is critical before committing to production.
The tool tests divisibility from 2 up to the square root of the number. If no divisors are found, the number is prime. This is efficient for numbers up to 10^12.
Yes. For non-prime numbers, all factors are listed. For prime numbers, the only factors are 1 and the number itself.
JavaScript handles numbers up to 2^53. The primality test works efficiently for numbers up to about 10^12. Larger numbers may require more time.
Yes. For composite numbers, the tool can show the prime factorization — the product of prime numbers that equals the original.
Yes. All calculations run in your browser. No data is transmitted.
Prime Factorization Calculator
Find the prime factors of any number. Shows the complete factorization tree and exponential form. Everything runs locally in your browser — nothing is uploaded.
Greatest Common Factor Calculator
Calculate the GCF/GCD of two or more numbers. Shows the prime factorization method step by step. Everything runs locally in your browser — nothing is uploaded.