51831816 has 32 divisors (see below), whose sum is σ = 134049600. Its totient is φ = 16681280.

The previous prime is 51831809. The next prime is 51831841. The reversal of 51831816 is 61813815.

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, 36540 + ... + 37931.

It is an arithmetic number, because the mean of its divisors is an integer number (4189050).

Almost surely, 2^51831816 is an apocalyptic number.

It is an amenable number.

51831816 is an abundant number, since it is smaller than the sum of its proper divisors (82217784).

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

51831816 is a wasteful number, since it uses less digits than its factorization.

51831816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74509 (or 74505 counting only the distinct ones).

The product of its digits is 5760, while the sum is 33.

The square root of 51831816 is about 7199.4316442341. The cubic root of 51831816 is about 372.8482780840.

The spelling of 51831816 in words is "fifty-one million, eight hundred thirty-one thousand, eight hundred sixteen".