57056891 has 4 divisors (see below), whose sum is σ = 59024400. Its totient is φ = 55089384.

The previous prime is 57056887. The next prime is 57056893. The reversal of 57056891 is 19865075.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 57056891 - 2² = 57056887 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (57056893) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 983711 + ... + 983768.

It is an arithmetic number, because the mean of its divisors is an integer number (14756100).

Almost surely, 2^57056891 is an apocalyptic number.

57056891 is a deficient number, since it is larger than the sum of its proper divisors (1967509).

57056891 is a wasteful number, since it uses less digits than its factorization.

57056891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1967508.

The product of its (nonzero) digits is 75600, while the sum is 41.

The square root of 57056891 is about 7553.6011941325. The cubic root of 57056891 is about 384.9781086108.

The spelling of 57056891 in words is "fifty-seven million, fifty-six thousand, eight hundred ninety-one".