11111233231 has 16 divisors (see below), whose sum is σ = 13948070400. Its totient is φ = 8630363808.

The previous prime is 11111233223. The next prime is 11111233241. The reversal of 11111233231 is 13233211111.

It is a cyclic number.

It is not a de Polignac number, because 11111233231 - 2³ = 11111233223 is a prime.

It is a super-2 number, since 2×11111233231² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11111233199 and 11111233208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11111233241) 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, 1813096 + ... + 1819213.

It is an arithmetic number, because the mean of its divisors is an integer number (871754400).

Almost surely, 2^11111233231 is an apocalyptic number.

11111233231 is a deficient number, since it is larger than the sum of its proper divisors (2836837169).

11111233231 is a wasteful number, since it uses less digits than its factorization.

11111233231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3632358.

The product of its digits is 108, while the sum is 19.

Adding to 11111233231 its reverse (13233211111), we get a palindrome (24344444342).

The spelling of 11111233231 in words is "eleven billion, one hundred eleven million, two hundred thirty-three thousand, two hundred thirty-one".