23111 has 6 divisors (see below), whose sum is σ = 25536. Its totient is φ = 20900.

The previous prime is 23099. The next prime is 23117. The reversal of 23111 is 11132.

It is a de Polignac number, because none of the positive numbers 2^k-23111 is a prime.

It is an Ulam number.

It is a Duffinian number.

23111 is a modest number, since divided by 111 gives 23 as remainder.

It is a plaindrome in base 12.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23117) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 26 + ... + 216.

It is an arithmetic number, because the mean of its divisors is an integer number (4256).

2²³¹¹¹ is an apocalyptic number.

23111 is a deficient number, since it is larger than the sum of its proper divisors (2425).

23111 is a wasteful number, since it uses less digits than its factorization.

23111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 213 (or 202 counting only the distinct ones).

The product of its digits is 6, while the sum is 8.

The square root of 23111 is about 152.0230245719. The cubic root of 23111 is about 28.4843455632.

Adding to 23111 its reverse (11132), we get a palindrome (34243).

It can be divided in two parts, 231 and 11, that added together give a palindrome (242).

The spelling of 23111 in words is "twenty-three thousand, one hundred eleven", and thus it is an iban number.