51185898 has 32 divisors (see below), whose sum is σ = 117419520. Its totient is φ = 16511040.

The previous prime is 51185881. The next prime is 51185933. The reversal of 51185898 is 89858115.

51185898 is a `hidden beast` number, since 51 + 18 + 589 + 8 = 666.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13615 + ... + 16962.

It is an arithmetic number, because the mean of its divisors is an integer number (3669360).

Almost surely, 2^51185898 is an apocalyptic number.

51185898 is an abundant number, since it is smaller than the sum of its proper divisors (66233622).

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

51185898 is a wasteful number, since it uses less digits than its factorization.

51185898 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30619 (or 30613 counting only the distinct ones).

The product of its digits is 115200, while the sum is 45.

The square root of 51185898 is about 7154.4320529305. The cubic root of 51185898 is about 371.2930120556.

The spelling of 51185898 in words is "fifty-one million, one hundred eighty-five thousand, eight hundred ninety-eight".