51156816 has 40 divisors (see below), whose sum is σ = 139113120. Its totient is φ = 16154496.

The previous prime is 51156811. The next prime is 51156817. The reversal of 51156816 is 61865115.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51156811) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 27135 + ... + 28958.

It is an arithmetic number, because the mean of its divisors is an integer number (3477828).

Almost surely, 2^51156816 is an apocalyptic number.

It is an amenable number.

51156816 is an abundant number, since it is smaller than the sum of its proper divisors (87956304).

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

51156816 is a wasteful number, since it uses less digits than its factorization.

51156816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56123 (or 56117 counting only the distinct ones).

The product of its digits is 7200, while the sum is 33.

The square root of 51156816 is about 7152.3993177115. The cubic root of 51156816 is about 371.2226802556. Note that the first 3 decimals are identical.

The spelling of 51156816 in words is "fifty-one million, one hundred fifty-six thousand, eight hundred sixteen".