23155281 has 16 divisors (see below), whose sum is σ = 36110400. Its totient is φ = 14624064.

The previous prime is 23155277. The next prime is 23155289. The reversal of 23155281 is 18255132.

It is a happy number.

23155281 is a `hidden beast` number, since 2 + 31 + 552 + 81 = 666.

It is not a de Polignac number, because 23155281 - 2² = 23155277 is a prime.

It is a super-2 number, since 2×23155281² = 1072334076377922, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23155289) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22056 + ... + 23081.

It is an arithmetic number, because the mean of its divisors is an integer number (2256900).

Almost surely, 2^23155281 is an apocalyptic number.

It is an amenable number.

23155281 is a deficient number, since it is larger than the sum of its proper divisors (12955119).

23155281 is a wasteful number, since it uses less digits than its factorization.

23155281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45165 (or 45159 counting only the distinct ones).

The product of its digits is 2400, while the sum is 27.

The square root of 23155281 is about 4811.9934538609. The cubic root of 23155281 is about 285.0252609188.

It can be divided in two parts, 23155 and 281, that added together give a triangular number (23436 = T₂₁₆).

The spelling of 23155281 in words is "twenty-three million, one hundred fifty-five thousand, two hundred eighty-one".