231112111 has 4 divisors (see below), whose sum is σ = 231527592. Its totient is φ = 230696632.

The previous prime is 231112109. The next prime is 231112117. The reversal of 231112111 is 111211132.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 231112111 - 2¹ = 231112109 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 231112091 and 231112100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231112117) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 206905 + ... + 208018.

It is an arithmetic number, because the mean of its divisors is an integer number (57881898).

Almost surely, 2^231112111 is an apocalyptic number.

231112111 is a deficient number, since it is larger than the sum of its proper divisors (415481).

231112111 is an equidigital number, since it uses as much as digits as its factorization.

231112111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 415480.

The product of its digits is 12, while the sum is 13.

The square root of 231112111 is about 15202.3718873076. The cubic root of 231112111 is about 613.6784905134.

Adding to 231112111 its reverse (111211132), we get a palindrome (342323243).

It can be divided in two parts, 2311121 and 11, that added together give a palindrome (2311132).

The spelling of 231112111 in words is "two hundred thirty-one million, one hundred twelve thousand, one hundred eleven".