Check if any number is prime. Also shows all factors and whether the number is odd or even. Numbers never leave your device — every calculation runs locally in your browser.
Calculate the number of ways to arrange k items from n items (nPr). Shows the step-by-step permutation calculation. Numbers never leave your device — every calculation runs locally in your browser.
Calculate the factorial of any number (n!). Handles large numbers and shows the full multiplication sequence. Numbers never leave your device — every calculation runs locally in your browser.
Convert a Numerator/Denominator fraction to a 6-place decimal with percent and equivalents. Shows the decimal result directly. Numbers never leave your device — every calculation runs locally in your browser.
Stamp headers and footers on every PDF page — page numbers, dates, confidentiality lines. Number a 100-page report in one pass — local pdf-lib work, unlimited saves.
Add sequential Bates numbers to every page of your PDF. Customize prefix, starting number, and position. Prefixes, start numbers, and positioning per filing rules — local pdf-lib work, unlimited saves.
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
Break any integer into prime factors with factor trees — 60 = 2²×3×5 shown stepwise. Ace number theory homework — free, local, no signup.
Greatest Common Factor Calculator
Find the greatest common factor (GCF/GCD) of number sets via Euclidean algorithm with steps. Reduce 48:180 to 4:15 correctly — free, local, no signup.
Last updated October 2026