56750991 has 16 divisors (see below), whose sum is σ = 83369088. Its totient is φ = 34052000.

The previous prime is 56750989. The next prime is 56751031. The reversal of 56750991 is 19905765.

It is a cyclic number.

It is not a de Polignac number, because 56750991 - 2¹ = 56750989 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56750791) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5181 + ... + 11846.

It is an arithmetic number, because the mean of its divisors is an integer number (5210568).

Almost surely, 2^56750991 is an apocalyptic number.

56750991 is a deficient number, since it is larger than the sum of its proper divisors (26618097).

56750991 is a wasteful number, since it uses less digits than its factorization.

56750991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17142.

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

The square root of 56750991 is about 7533.3253613527. The cubic root of 56750991 is about 384.2888790334.

The spelling of 56750991 in words is "fifty-six million, seven hundred fifty thousand, nine hundred ninety-one".