51121312116 has 36 divisors (see below), whose sum is σ = 138757848768. Its totient is φ = 14606089008.

The previous prime is 51121312097. The next prime is 51121312129. The reversal of 51121312116 is 61121312115.

51121312116 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×51121312116² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 43469916 + ... + 43471091.

It is an arithmetic number, because the mean of its divisors is an integer number (3854384688).

Almost surely, 2^51121312116 is an apocalyptic number.

It is an amenable number.

51121312116 is an abundant number, since it is smaller than the sum of its proper divisors (87636536652).

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

51121312116 is a wasteful number, since it uses less digits than its factorization.

51121312116 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86941028 (or 86941019 counting only the distinct ones).

The product of its digits is 360, while the sum is 24.

Subtracting 51121312116 from its reverse (61121312115), we obtain a palindrome (9999999999).

The spelling of 51121312116 in words is "fifty-one billion, one hundred twenty-one million, three hundred twelve thousand, one hundred sixteen".