51031500320 has 96 divisors (see below), whose sum is σ = 127729260288. Its totient is φ = 19200503808.

The previous prime is 51031500319. The next prime is 51031500329. The reversal of 51031500320 is 2300513015.

51031500320 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 51031500292 and 51031500301.

It is not an unprimeable number, because it can be changed into a prime (51031500329) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5661257 + ... + 5670263.

It is an arithmetic number, because the mean of its divisors is an integer number (1330513128).

Almost surely, 2^51031500320 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51031500320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (63864630144).

51031500320 is an abundant number, since it is smaller than the sum of its proper divisors (76697759968).

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

51031500320 is a wasteful number, since it uses less digits than its factorization.

51031500320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11122 (or 11114 counting only the distinct ones).

The product of its (nonzero) digits is 450, while the sum is 20.

The spelling of 51031500320 in words is "fifty-one billion, thirty-one million, five hundred thousand, three hundred twenty".