51055520 has 24 divisors (see below), whose sum is σ = 120619044. Its totient is φ = 20422144.

The previous prime is 51055519. The next prime is 51055553. The reversal of 51055520 is 2555015.

It can be written as a sum of positive squares in 2 ways, for example, as 50865424 + 190096 = 7132^2 + 436^2 .

It is a super-2 number, since 2×51055520² = 5213332244940800, which contains 22 as substring.

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, 159389 + ... + 159708.

Almost surely, 2^51055520 is an apocalyptic number.

It is an amenable number.

51055520 is an abundant number, since it is smaller than the sum of its proper divisors (69563524).

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

51055520 is a wasteful number, since it uses less digits than its factorization.

51055520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 319112 (or 319104 counting only the distinct ones).

The product of its (nonzero) digits is 1250, while the sum is 23.

The square root of 51055520 is about 7145.3145487095. The cubic root of 51055520 is about 370.9774980722.

The spelling of 51055520 in words is "fifty-one million, fifty-five thousand, five hundred twenty".