51212520 has 64 divisors (see below), whose sum is σ = 170712000. Its totient is φ = 13656384.

The previous prime is 51212519. The next prime is 51212533. The reversal of 51212520 is 2521215.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 51212493 and 51212502.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22630 + ... + 24789.

It is an arithmetic number, because the mean of its divisors is an integer number (2667375).

Almost surely, 2^51212520 is an apocalyptic number.

It is an amenable number.

51212520 is an abundant number, since it is smaller than the sum of its proper divisors (119499480).

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

51212520 is a wasteful number, since it uses less digits than its factorization.

51212520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47439 (or 47429 counting only the distinct ones).

The product of its (nonzero) digits is 200, while the sum is 18.

The square root of 51212520 is about 7156.2923361193. The cubic root of 51212520 is about 371.3573712495.

Adding to 51212520 its reverse (2521215), we get a palindrome (53733735).

The spelling of 51212520 in words is "fifty-one million, two hundred twelve thousand, five hundred twenty".