111131231231 has 16 divisors (see below), whose sum is σ = 113261263488. Its totient is φ = 109015869600.

The previous prime is 111131231221. The next prime is 111131231261. The reversal of 111131231231 is 132132131111.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-111131231231 is a prime.

It is a super-2 number, since 2×111131231231² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111131231221) 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, 23527436 + ... + 23532158.

It is an arithmetic number, because the mean of its divisors is an integer number (7078828968).

Almost surely, 2^111131231231 is an apocalyptic number.

111131231231 is a deficient number, since it is larger than the sum of its proper divisors (2130032257).

111131231231 is a wasteful number, since it uses less digits than its factorization.

111131231231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6182.

The product of its digits is 108, while the sum is 20.

Adding to 111131231231 its reverse (132132131111), we get a palindrome (243263362342).

The spelling of 111131231231 in words is "one hundred eleven billion, one hundred thirty-one million, two hundred thirty-one thousand, two hundred thirty-one".