Numbers Tools — 15 tools

Number Base Converter

Convert numbers between any bases 2–36.

binary hex octal

Roman Numerals

Convert between Roman numerals and integers.

roman latin ancient

Prime Number Checker

Check if a number is prime and list factors.

prime factor

Prime Factorization

Decompose a number into prime factors.

factor prime decompose

GCD & LCM

Compute GCD and LCM of two numbers.

greatest common divisor

Fibonacci Sequence

Generate Fibonacci numbers up to N.

sequence golden ratio

Modular Arithmetic

Operations under a given modulus.

mod remainder congruence

Extended Euclidean

Find Bézout coefficients with extended GCD.

bezout gcd linear

Chinese Remainder Theorem

Solve systems of congruences.

crt congruence system

Euler's Totient φ(n)

Compute Euler's totient function.

phi coprime euler

Number to Words

Spell out a number in English words.

spell english words

Big Number Arithmetic

Add, subtract, multiply large integers.

arbitrary precision large

Continued Fractions

Convert fractions to/from continued fractions.

cf rational approximation

Collatz Sequence

Generate the Collatz (3n+1) sequence.

conjecture hailstone 3n+1

Number Bases Table

Show a number in all common bases simultaneously.

conversion table reference