23155891 has 12 divisors (see below), whose sum is σ = 26334000. Its totient is φ = 20321840.

The previous prime is 23155879. The next prime is 23155897. The reversal of 23155891 is 19855132.

It is not a de Polignac number, because 23155891 - 2¹¹ = 23153843 is a prime.

It is not an unprimeable number, because it can be changed into a prime (23155897) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 210 + ... + 6808.

It is an arithmetic number, because the mean of its divisors is an integer number (2194500).

Almost surely, 2^23155891 is an apocalyptic number.

23155891 is a deficient number, since it is larger than the sum of its proper divisors (3178109).

23155891 is a wasteful number, since it uses less digits than its factorization.

23155891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6650 (or 6639 counting only the distinct ones).

The product of its digits is 10800, while the sum is 34.

The square root of 23155891 is about 4812.0568367383. The cubic root of 23155891 is about 285.0277637875.

It can be divided in two parts, 231 and 55891, that multiplied together give a triangular number (12910821 = T₅₀₈₁).

The spelling of 23155891 in words is "twenty-three million, one hundred fifty-five thousand, eight hundred ninety-one".