1231113111 has 16 divisors (see below), whose sum is σ = 1716417024. Its totient is φ = 783424224.

The previous prime is 1231113061. The next prime is 1231113119. The reversal of 1231113111 is 1113111321.

It is not a de Polignac number, because 1231113111 - 2¹⁸ = 1230850967 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1231113119) 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, 15285 + ... + 51921.

It is an arithmetic number, because the mean of its divisors is an integer number (107276064).

Almost surely, 2^1231113111 is an apocalyptic number.

1231113111 is a deficient number, since it is larger than the sum of its proper divisors (485303913).

1231113111 is a wasteful number, since it uses less digits than its factorization.

1231113111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37150.

The product of its digits is 18, while the sum is 15.

The square root of 1231113111 is about 35087.2214773413. The cubic root of 1231113111 is about 1071.7643790346.

Adding to 1231113111 its reverse (1113111321), we get a palindrome (2344224432).

The spelling of 1231113111 in words is "one billion, two hundred thirty-one million, one hundred thirteen thousand, one hundred eleven".