51511856 has 30 divisors (see below), whose sum is σ = 109078956. Its totient is φ = 23371200.

The previous prime is 51511847. The next prime is 51511861. The reversal of 51511856 is 65811515.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 94946 + ... + 95486.

Almost surely, 2^51511856 is an apocalyptic number.

It is an amenable number.

51511856 is an abundant number, since it is smaller than the sum of its proper divisors (57567100).

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

51511856 is an equidigital number, since it uses as much as digits as its factorization.

51511856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1101 (or 554 counting only the distinct ones).

The product of its digits is 6000, while the sum is 32.

The square root of 51511856 is about 7177.1760463291. The cubic root of 51511856 is about 372.0794912409.

It can be divided in two parts, 5151 and 1856, that added together give a palindrome (7007).

The spelling of 51511856 in words is "fifty-one million, five hundred eleven thousand, eight hundred fifty-six".