51516812 has 12 divisors (see below), whose sum is σ = 90209616. Its totient is φ = 25742640.

The previous prime is 51516811. The next prime is 51516833. The reversal of 51516812 is 21861515.

It is a hoax number, since the sum of its digits (29) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (51516811) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6458 + ... + 12030.

It is an arithmetic number, because the mean of its divisors is an integer number (7517468).

Almost surely, 2^51516812 is an apocalyptic number.

It is an amenable number.

51516812 is a deficient number, since it is larger than the sum of its proper divisors (38692804).

51516812 is a wasteful number, since it uses less digits than its factorization.

51516812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7888 (or 7886 counting only the distinct ones).

The product of its digits is 2400, while the sum is 29.

The square root of 51516812 is about 7177.5212991673. The cubic root of 51516812 is about 372.0914235543.

The spelling of 51516812 in words is "fifty-one million, five hundred sixteen thousand, eight hundred twelve".