23155111 has 4 divisors (see below), whose sum is σ = 26462992. Its totient is φ = 19847232.

The previous prime is 23155063. The next prime is 23155123. The reversal of 23155111 is 11155132.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-23155111 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23155151) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1653930 + ... + 1653943.

It is an arithmetic number, because the mean of its divisors is an integer number (6615748).

Almost surely, 2^23155111 is an apocalyptic number.

23155111 is a deficient number, since it is larger than the sum of its proper divisors (3307881).

23155111 is an equidigital number, since it uses as much as digits as its factorization.

23155111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3307880.

The product of its digits is 150, while the sum is 19.

The square root of 23155111 is about 4811.9757896315. The cubic root of 23155111 is about 285.0245633902.

The spelling of 23155111 in words is "twenty-three million, one hundred fifty-five thousand, one hundred eleven".