811112211117 has 48 divisors (see below), whose sum is σ = 1266568391088. Its totient is φ = 497235594240.

The previous prime is 811112211113. The next prime is 811112211131. The reversal of 811112211117 is 711112211118.

It is a happy number.

811112211117 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 8 ways, for example, as 327167984196 + 483944226921 = 571986^2 + 695661^2 .

It is not a de Polignac number, because 811112211117 - 2² = 811112211113 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (811112211113) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 33266943 + ... + 33291315.

It is an arithmetic number, because the mean of its divisors is an integer number (26386841481).

Almost surely, 2^811112211117 is an apocalyptic number.

It is an amenable number.

811112211117 is a deficient number, since it is larger than the sum of its proper divisors (455456179971).

811112211117 is a wasteful number, since it uses less digits than its factorization.

811112211117 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25470 (or 25467 counting only the distinct ones).

The product of its digits is 224, while the sum is 27.

Subtracting from 811112211117 its reverse (711112211118), we obtain a palindrome (99999999999).

The spelling of 811112211117 in words is "eight hundred eleven billion, one hundred twelve million, two hundred eleven thousand, one hundred seventeen".