51531684 has 24 divisors (see below), whose sum is σ = 125469120. Its totient is φ = 16430304.

The previous prime is 51531679. The next prime is 51531731. The reversal of 51531684 is 48613515.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 93079 + ... + 93630.

It is an arithmetic number, because the mean of its divisors is an integer number (5227880).

Almost surely, 2^51531684 is an apocalyptic number.

It is an amenable number.

51531684 is an abundant number, since it is smaller than the sum of its proper divisors (73937436).

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

51531684 is a wasteful number, since it uses less digits than its factorization.

51531684 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 186739 (or 186737 counting only the distinct ones).

The product of its digits is 14400, while the sum is 33.

The square root of 51531684 is about 7178.5572366597. The cubic root of 51531684 is about 372.1272255318.

The spelling of 51531684 in words is "fifty-one million, five hundred thirty-one thousand, six hundred eighty-four".