Checkers

Check if the given number is a Leyland number.

Check if the given number is an Achilles number.

Learn about almost perfect numbers, their definition, and how to check for them using the Almost Perfect Number Checker. Discover solved examples and delve into the captivating realm of number theory.

Check if the given number is a Hilbert number.

Check if the given number is a Chen Prime.

Check if the given number is a Unusual Number.

Check if the given number is a permutable prime.

Check if the given number is a Vampire number.

Check if the given number is an Ulam number. For example, Is 180 an Ulam number?

Check if the given number is a strong prime. For example, Is 101 a strong prime?

Check if the given number is a practical number. For example, Is 100 a practical number?

Check if the given number is a Perrin number. For example, Is 68 a Perrin number?

Check if the given number is a Pell number. For example, Is 169 a Pell number?

Check if the given number is a powerful number. Such as, Is 2000 a powerful number?

Check if the given number is a square triangular number. For example, Is 36 a square triangular number?