56057991 has 8 divisors (see below), whose sum is σ = 81538944. Its totient is φ = 33974520.

The previous prime is 56057983. The next prime is 56058001. The reversal of 56057991 is 19975065.

56057991 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 56057991 - 2³ = 56057983 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56057921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 849331 + ... + 849396.

It is an arithmetic number, because the mean of its divisors is an integer number (10192368).

Almost surely, 2^56057991 is an apocalyptic number.

56057991 is a deficient number, since it is larger than the sum of its proper divisors (25480953).

56057991 is a wasteful number, since it uses less digits than its factorization.

56057991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1698741.

The product of its (nonzero) digits is 85050, while the sum is 42.

The square root of 56057991 is about 7487.1884576255. The cubic root of 56057991 is about 382.7182538425.

The spelling of 56057991 in words is "fifty-six million, fifty-seven thousand, nine hundred ninety-one".