51816879 has 12 divisors (see below), whose sum is σ = 74935536. Its totient is φ = 34503552.

The previous prime is 51816871. The next prime is 51816883. The reversal of 51816879 is 97861815.

51816879 is a `hidden beast` number, since 518 + 1 + 68 + 79 = 666.

It is not a de Polignac number, because 51816879 - 2³ = 51816871 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51816871) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5919 + ... + 11775.

It is an arithmetic number, because the mean of its divisors is an integer number (6244628).

Almost surely, 2^51816879 is an apocalyptic number.

51816879 is a deficient number, since it is larger than the sum of its proper divisors (23118657).

51816879 is a wasteful number, since it uses less digits than its factorization.

51816879 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6846 (or 6843 counting only the distinct ones).

The product of its digits is 120960, while the sum is 45.

The square root of 51816879 is about 7198.3941959301. The cubic root of 51816879 is about 372.8124585801.

The spelling of 51816879 in words is "fifty-one million, eight hundred sixteen thousand, eight hundred seventy-nine".