51564894 has 16 divisors (see below), whose sum is σ = 103431168. Its totient is φ = 17138072.

The previous prime is 51564883. The next prime is 51564901. The reversal of 51564894 is 49846515.

51564894 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

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, 10302 + ... + 14465.

It is an arithmetic number, because the mean of its divisors is an integer number (6464448).

Almost surely, 2^51564894 is an apocalyptic number.

51564894 is an abundant number, since it is smaller than the sum of its proper divisors (51866274).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51564894 is a wasteful number, since it uses less digits than its factorization.

51564894 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25119.

The product of its digits is 172800, while the sum is 42.

The square root of 51564894 is about 7180.8700030010. The cubic root of 51564894 is about 372.2071484733.

The spelling of 51564894 in words is "fifty-one million, five hundred sixty-four thousand, eight hundred ninety-four".