56395991 has 2 divisors, whose sum is σ = 56395992. Its totient is φ = 56395990.

The previous prime is 56395979. The next prime is 56396051. The reversal of 56395991 is 19959365.

56395991 is nontrivially palindromic in base 4.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-56395991 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (56395901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28197995 + 28197996.

It is an arithmetic number, because the mean of its divisors is an integer number (28197996).

Almost surely, 2^56395991 is an apocalyptic number.

56395991 is a deficient number, since it is larger than the sum of its proper divisors (1).

56395991 is an equidigital number, since it uses as much as digits as its factorization.

56395991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 328050, while the sum is 47.

The square root of 56395991 is about 7509.7264264419. The cubic root of 56395991 is about 383.4859091854.

The spelling of 56395991 in words is "fifty-six million, three hundred ninety-five thousand, nine hundred ninety-one".