51465881 has 12 divisors (see below), whose sum is σ = 54149760. Its totient is φ = 48909960.

The previous prime is 51465857. The next prime is 51465899. The reversal of 51465881 is 18856415.

It is not a de Polignac number, because 51465881 - 2¹⁰ = 51464857 is a prime.

It is a super-2 number, since 2×51465881² = 5297473814212322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51465811) 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, 143180 + ... + 143538.

It is an arithmetic number, because the mean of its divisors is an integer number (4512480).

Almost surely, 2^51465881 is an apocalyptic number.

It is an amenable number.

51465881 is a deficient number, since it is larger than the sum of its proper divisors (2683879).

51465881 is a wasteful number, since it uses less digits than its factorization.

51465881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 676 (or 653 counting only the distinct ones).

The product of its digits is 38400, while the sum is 38.

The square root of 51465881 is about 7173.9724699778. The cubic root of 51465881 is about 371.9687630340.

The spelling of 51465881 in words is "fifty-one million, four hundred sixty-five thousand, eight hundred eighty-one".