51456881 has 4 divisors (see below), whose sum is σ = 58807872. Its totient is φ = 44105892.

The previous prime is 51456877. The next prime is 51456893. The reversal of 51456881 is 18865415.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 51456881 - 2² = 51456877 is a prime.

It is a super-2 number, since 2×51456881² = 5295621204496322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51452881) 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, 3675485 + ... + 3675498.

It is an arithmetic number, because the mean of its divisors is an integer number (14701968).

Almost surely, 2^51456881 is an apocalyptic number.

It is an amenable number.

51456881 is a deficient number, since it is larger than the sum of its proper divisors (7350991).

51456881 is an equidigital number, since it uses as much as digits as its factorization.

51456881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7350990.

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

The square root of 51456881 is about 7173.3451750212. The cubic root of 51456881 is about 371.9470793220.

The spelling of 51456881 in words is "fifty-one million, four hundred fifty-six thousand, eight hundred eighty-one".