51031304520 has 128 divisors (see below), whose sum is σ = 177179443200. Its totient is φ = 11516633856.

The previous prime is 51031304507. The next prime is 51031304521. The reversal of 51031304520 is 2540313015.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is not an unprimeable number, because it can be changed into a prime (51031304521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 318144 + ... + 450863.

It is an arithmetic number, because the mean of its divisors is an integer number (1384214400).

Almost surely, 2^51031304520 is an apocalyptic number.

It is an amenable number.

51031304520 is an abundant number, since it is smaller than the sum of its proper divisors (126148138680).

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

51031304520 is a wasteful number, since it uses less digits than its factorization.

51031304520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 769107 (or 769103 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 24.

Adding to 51031304520 its reverse (2540313015), we get a palindrome (53571617535).

The spelling of 51031304520 in words is "fifty-one billion, thirty-one million, three hundred four thousand, five hundred twenty".