51510920 has 32 divisors (see below), whose sum is σ = 116343000. Its totient is φ = 20525568.

The previous prime is 51510913. The next prime is 51510929. The reversal of 51510920 is 2901515.

51510920 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 46321636 + 5189284 = 6806^2 + 2278^2 .

It is a super-3 number, since 3×51510920³ (a number of 24 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (51510929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8756 + ... + 13404.

Almost surely, 2^51510920 is an apocalyptic number.

It is an amenable number.

51510920 is an abundant number, since it is smaller than the sum of its proper divisors (64832080).

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

51510920 is a wasteful number, since it uses less digits than its factorization.

51510920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4937 (or 4933 counting only the distinct ones).

The product of its (nonzero) digits is 450, while the sum is 23.

The square root of 51510920 is about 7177.1108393280. The cubic root of 51510920 is about 372.0772375946.

The spelling of 51510920 in words is "fifty-one million, five hundred ten thousand, nine hundred twenty".