51255564 has 12 divisors (see below), whose sum is σ = 119596344. Its totient is φ = 17085184.

The previous prime is 51255551. The next prime is 51255577. The reversal of 51255564 is 46555215.

It is an interprime number because it is at equal distance from previous prime (51255551) and next prime (51255577).

It is a tau number, because it is divible by the number of its divisors (12).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2135637 + ... + 2135660.

It is an arithmetic number, because the mean of its divisors is an integer number (9966362).

Almost surely, 2^51255564 is an apocalyptic number.

It is an amenable number.

51255564 is an abundant number, since it is smaller than the sum of its proper divisors (68340780).

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

51255564 is a wasteful number, since it uses less digits than its factorization.

51255564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4271304 (or 4271302 counting only the distinct ones).

The product of its digits is 30000, while the sum is 33.

The square root of 51255564 is about 7159.2991277080. The cubic root of 51255564 is about 371.4613837735.

The spelling of 51255564 in words is "fifty-one million, two hundred fifty-five thousand, five hundred sixty-four".