51328881 has 12 divisors (see below), whose sum is σ = 74975940. Its totient is φ = 33834240.

The previous prime is 51328873. The next prime is 51328883. The reversal of 51328881 is 18882315.

It can be written as a sum of positive squares in 2 ways, for example, as 13395600 + 37933281 = 3660^2 + 6159^2 .

It is not a de Polignac number, because 51328881 - 2³ = 51328873 is a prime.

It is a super-2 number, since 2×51328881² = 5269308049424322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (51328883) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 31240 + ... + 32841.

It is an arithmetic number, because the mean of its divisors is an integer number (6247995).

Almost surely, 2^51328881 is an apocalyptic number.

It is an amenable number.

51328881 is a deficient number, since it is larger than the sum of its proper divisors (23647059).

51328881 is a wasteful number, since it uses less digits than its factorization.

51328881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64176 (or 64173 counting only the distinct ones).

The product of its digits is 15360, while the sum is 36.

The square root of 51328881 is about 7164.4177013907. The cubic root of 51328881 is about 371.6384146940.

The spelling of 51328881 in words is "fifty-one million, three hundred twenty-eight thousand, eight hundred eighty-one".