23111131 has 6 divisors (see below), whose sum is σ = 23499996. Its totient is φ = 22728600.

The previous prime is 23111119. The next prime is 23111149. The reversal of 23111131 is 13111132.

It is not a de Polignac number, because 23111131 - 2¹¹ = 23109083 is a prime.

It is a super-2 number, since 2×23111131² = 1068248752198322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (23111531) 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 5 ways as a sum of consecutive naturals, for example, 616 + ... + 6826.

It is an arithmetic number, because the mean of its divisors is an integer number (3916666).

Almost surely, 2^23111131 is an apocalyptic number.

23111131 is a deficient number, since it is larger than the sum of its proper divisors (388865).

23111131 is an frugal number, since it uses more digits than its factorization.

23111131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6333 (or 6272 counting only the distinct ones).

The product of its digits is 18, while the sum is 13.

The square root of 23111131 is about 4807.4037691877. The cubic root of 23111131 is about 284.8439938232.

Adding to 23111131 its reverse (13111132), we get a palindrome (36222263).

Subtracting from 23111131 its reverse (13111132), we obtain a palindrome (9999999).

The spelling of 23111131 in words is "twenty-three million, one hundred eleven thousand, one hundred thirty-one".