51565120 has 28 divisors (see below), whose sum is σ = 122790204. Its totient is φ = 20625920.

The previous prime is 51565109. The next prime is 51565123. The reversal of 51565120 is 2156515.

It can be written as a sum of positive squares in 2 ways, for example, as 11723776 + 39841344 = 3424^2 + 6312^2 .

It is a super-2 number, since 2×51565120² = 5317923201228800, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (51565123) 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, 80251 + ... + 80890.

Almost surely, 2^51565120 is an apocalyptic number.

It is an amenable number.

51565120 is an abundant number, since it is smaller than the sum of its proper divisors (71225084).

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

51565120 is a wasteful number, since it uses less digits than its factorization.

51565120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161158 (or 161148 counting only the distinct ones).

The product of its (nonzero) digits is 1500, while the sum is 25.

The square root of 51565120 is about 7180.8857392386. The cubic root of 51565120 is about 372.2076922457.

The spelling of 51565120 in words is "fifty-one million, five hundred sixty-five thousand, one hundred twenty".