Prime numbers, GCD, LCM, Fibonacci, and number property calculators.
Most used tools
Check if a number is prime
Decompose a number into prime factors
Find the greatest common divisor of two numbers
Find the nth Fibonacci number
Recently popular tools
20 tools available
Check if a number is prime
Decompose a number into prime factors
List all primes up to a limit
Find the nth prime number
Find the greatest common divisor of two numbers
Find the least common multiple of two numbers
List all divisors of a number
Count the divisors of a number (τ(n))
Sum all divisors of a number (σ(n))
Calculate Euler's totient function φ(n)
Compute modular exponentiation using Fermat's Little Theorem
Calculate a^b mod m for large exponents
Find a⁻¹ mod m
Find the nth Fibonacci number
Compute the nth Catalan number Cn
Compute the nth Bell number Bn
Trace the 3n+1 sequence and count steps
Sum the digits of a number
Reverse the digits of a number
Check if a number is perfect
More math tools available
Our number theory calculators provide accurate, instant results for students, teachers, and professionals. Each calculator uses mathematically verified formulas and handles edge cases like invalid inputs, division by zero, and overflow conditions.
Whether you need to solve equations, compute integrals, find prime factors, or convert between number bases, our number theory tools deliver reliable results with step-by-step explanations to help you understand the underlying mathematics.
