18 calculators available
Check if a number is prime or composite.
Generate a list of prime numbers up to a given limit.
Convert any number to its written English words.
Convert between Arabic and Roman numerals.
Convert between binary, decimal, hex, and octal.
Convert hexadecimal to decimal and other bases.
Convert octal numbers to decimal and binary.
Calculate Fibonacci sequence numbers.
Find all partitions of a positive integer.
Calculate the sum of digits of any number.
Check if a number or word reads the same forward and backward.
Convert numbers between any two bases (2–36).
Calculate the cube root of any number.
Calculate the nth root of a number.
Determine if a number is even or odd.
Check divisibility rules for 2, 3, 4, 5, 6, 9, 10.
Generate the Collatz sequence for any starting number.
Check if two numbers are amicable.