51178986 has 32 divisors (see below), whose sum is σ = 115297920. Its totient is φ = 16824672.

The previous prime is 51178931. The next prime is 51178991. The reversal of 51178986 is 68987115.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2550 + ... + 10433.

It is an arithmetic number, because the mean of its divisors is an integer number (3603060).

Almost surely, 2^51178986 is an apocalyptic number.

51178986 is an abundant number, since it is smaller than the sum of its proper divisors (64118934).

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

51178986 is a wasteful number, since it uses less digits than its factorization.

51178986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13067 (or 13061 counting only the distinct ones).

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

The square root of 51178986 is about 7153.9489794099. The cubic root of 51178986 is about 371.2762985145.

It can be divided in two parts, 511 and 78986, that added together give a palindrome (79497).

The spelling of 51178986 in words is "fifty-one million, one hundred seventy-eight thousand, nine hundred eighty-six".