23111231 has 16 divisors (see below), whose sum is σ = 28092960. Its totient is φ = 18721920.

The previous prime is 23111219. The next prime is 23111237. The reversal of 23111231 is 13211132.

It is a cyclic number.

It is not a de Polignac number, because 23111231 - 2¹⁸ = 22849087 is a prime.

It is a super-2 number, since 2×23111231² = 1068257996670722, which 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 (23111237) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1361 + ... + 6933.

It is an arithmetic number, because the mean of its divisors is an integer number (1755810).

Almost surely, 2^23111231 is an apocalyptic number.

23111231 is a deficient number, since it is larger than the sum of its proper divisors (4981729).

23111231 is a wasteful number, since it uses less digits than its factorization.

23111231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5626.

The product of its digits is 36, while the sum is 14.

The square root of 23111231 is about 4807.4141698006. The cubic root of 23111231 is about 284.8444046549.

Adding to 23111231 its reverse (13211132), we get a palindrome (36322363).

Subtracting from 23111231 its reverse (13211132), we obtain a palindrome (9900099).

The spelling of 23111231 in words is "twenty-three million, one hundred eleven thousand, two hundred thirty-one".