51010431320 has 64 divisors (see below), whose sum is σ = 120049007040. Its totient is φ = 19470528000.

The previous prime is 51010431299. The next prime is 51010431331. The reversal of 51010431320 is 2313401015.

51010431320 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 = 51010431292 and 51010431301.

It is a congruent number.

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, 321470 + ... + 453170.

It is an arithmetic number, because the mean of its divisors is an integer number (1875765735).

Almost surely, 2^51010431320 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 51010431320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (60024503520).

51010431320 is an abundant number, since it is smaller than the sum of its proper divisors (69038575720).

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

51010431320 is a wasteful number, since it uses less digits than its factorization.

51010431320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132156 (or 132152 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 20.

Adding to 51010431320 its reverse (2313401015), we get a palindrome (53323832335).

The spelling of 51010431320 in words is "fifty-one billion, ten million, four hundred thirty-one thousand, three hundred twenty".