23131131111 has 24 divisors (see below), whose sum is σ = 36491918736. Its totient is φ = 14002381440.

The previous prime is 23131131097. The next prime is 23131131113. The reversal of 23131131111 is 11113113132.

23131131111 is a `hidden beast` number, since 2 + 31 + 311 + 311 + 11 = 666.

It is not a de Polignac number, because 23131131111 - 2⁶ = 23131131047 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23131131113) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 52510 + ... + 221403.

It is an arithmetic number, because the mean of its divisors is an integer number (1520496614).

Almost surely, 2^23131131111 is an apocalyptic number.

23131131111 is a deficient number, since it is larger than the sum of its proper divisors (13360787625).

23131131111 is a wasteful number, since it uses less digits than its factorization.

23131131111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 274783 (or 274780 counting only the distinct ones).

The product of its digits is 54, while the sum is 18.

Adding to 23131131111 its reverse (11113113132), we get a palindrome (34244244243).

The spelling of 23131131111 in words is "twenty-three billion, one hundred thirty-one million, one hundred thirty-one thousand, one hundred eleven".