56811691 has 16 divisors (see below), whose sum is σ = 61719840. Its totient is φ = 52116480.

The previous prime is 56811659. The next prime is 56811697. The reversal of 56811691 is 19611865.

56811691 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 56811691 - 2⁵ = 56811659 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 56811691.

It is not an unprimeable number, because it can be changed into a prime (56811697) 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 15 ways as a sum of consecutive naturals, for example, 181351 + ... + 181663.

It is an arithmetic number, because the mean of its divisors is an integer number (3857490).

Almost surely, 2^56811691 is an apocalyptic number.

56811691 is a deficient number, since it is larger than the sum of its proper divisors (4908149).

56811691 is a wasteful number, since it uses less digits than its factorization.

56811691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 606.

The product of its digits is 12960, while the sum is 37.

The square root of 56811691 is about 7537.3530499772. The cubic root of 56811691 is about 384.4258400684.

The spelling of 56811691 in words is "fifty-six million, eight hundred eleven thousand, six hundred ninety-one".