51113431116 has 144 divisors (see below), whose sum is σ = 147983996160. Its totient is φ = 14724167040.

The previous prime is 51113431099. The next prime is 51113431121. The reversal of 51113431116 is 61113431115.

51113431116 is a `hidden beast` number, since 5 + 1 + 113 + 431 + 116 = 666.

It is a super-2 number, since 2×51113431116² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 51113431116.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1467390 + ... + 1501818.

It is an arithmetic number, because the mean of its divisors is an integer number (1027666640).

Almost surely, 2^51113431116 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 51113431116, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (73991998080).

51113431116 is an abundant number, since it is smaller than the sum of its proper divisors (96870565044).

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

51113431116 is a wasteful number, since it uses less digits than its factorization.

51113431116 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34636 (or 34631 counting only the distinct ones).

The product of its digits is 1080, while the sum is 27.

Subtracting 51113431116 from its reverse (61113431115), we obtain a palindrome (9999999999).

The spelling of 51113431116 in words is "fifty-one billion, one hundred thirteen million, four hundred thirty-one thousand, one hundred sixteen".