56391983 has 2 divisors, whose sum is σ = 56391984. Its totient is φ = 56391982.

The previous prime is 56391971. The next prime is 56391991. The reversal of 56391983 is 38919365.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 56391983 - 2⁴ = 56391967 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (56396983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28195991 + 28195992.

It is an arithmetic number, because the mean of its divisors is an integer number (28195992).

Almost surely, 2^56391983 is an apocalyptic number.

56391983 is a deficient number, since it is larger than the sum of its proper divisors (1).

56391983 is an equidigital number, since it uses as much as digits as its factorization.

56391983 is an evil number, because the sum of its binary digits is even.

The product of its digits is 174960, while the sum is 44.

The square root of 56391983 is about 7509.4595677718. The cubic root of 56391983 is about 383.4768243320.

The spelling of 56391983 in words is "fifty-six million, three hundred ninety-one thousand, nine hundred eighty-three".