51831556 has 12 divisors (see below), whose sum is σ = 103663168. Its totient is φ = 22213512.

The previous prime is 51831541. The next prime is 51831583. The reversal of 51831556 is 65513815.

51831556 is an admirable number.

It is a super-2 number, since 2×51831556² = 5373020394762272, which contains 22 as substring.

It is a hoax number, since the sum of its digits (34) coincides with the sum of the digits of its distinct prime factors.

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 3 ways as a sum of consecutive naturals, for example, 925536 + ... + 925591.

Almost surely, 2^51831556 is an apocalyptic number.

It is an amenable number.

51831556 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

51831556 is a wasteful number, since it uses less digits than its factorization.

51831556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1851138 (or 1851136 counting only the distinct ones).

The product of its digits is 18000, while the sum is 34.

The square root of 51831556 is about 7199.4135872306. The cubic root of 51831556 is about 372.8476546528.

The spelling of 51831556 in words is "fifty-one million, eight hundred thirty-one thousand, five hundred fifty-six".