51108111081 has 16 divisors (see below), whose sum is σ = 75728977920. Its totient is φ = 34066108080.

The previous prime is 51108110981. The next prime is 51108111179. The reversal of 51108111081 is 18011180115.

It is not a de Polignac number, because 51108111081 - 2²¹ = 51106013929 is a prime.

It is a super-3 number, since 3×51108111081³ (a number of 33 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (51108161081) 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, 5865 + ... + 319766.

It is an arithmetic number, because the mean of its divisors is an integer number (4733061120).

Almost surely, 2^51108111081 is an apocalyptic number.

It is an amenable number.

51108111081 is a deficient number, since it is larger than the sum of its proper divisors (24620866839).

51108111081 is a wasteful number, since it uses less digits than its factorization.

51108111081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 331453 (or 331447 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 27.

Adding to 51108111081 its reverse (18011180115), we get a palindrome (69119291196).

The spelling of 51108111081 in words is "fifty-one billion, one hundred eight million, one hundred eleven thousand, eighty-one".