56037991 has 2 divisors, whose sum is σ = 56037992. Its totient is φ = 56037990.

The previous prime is 56037983. The next prime is 56038007. The reversal of 56037991 is 19973065.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 56037991 - 2³ = 56037983 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (56037941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28018995 + 28018996.

It is an arithmetic number, because the mean of its divisors is an integer number (28018996).

Almost surely, 2^56037991 is an apocalyptic number.

56037991 is a deficient number, since it is larger than the sum of its proper divisors (1).

56037991 is an equidigital number, since it uses as much as digits as its factorization.

56037991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 51030, while the sum is 40.

The square root of 56037991 is about 7485.8527236381. The cubic root of 56037991 is about 382.6727338645.

The spelling of 56037991 in words is "fifty-six million, thirty-seven thousand, nine hundred ninety-one".