23831281 has 4 divisors (see below), whose sum is σ = 24600064. Its totient is φ = 23062500.

The previous prime is 23831267. The next prime is 23831299. The reversal of 23831281 is 18213832.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 23831281 - 2⁷ = 23831153 is a prime.

It is a super-2 number, since 2×23831281² = 1135859908201922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (23831201) 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, 384345 + ... + 384406.

It is an arithmetic number, because the mean of its divisors is an integer number (6150016).

Almost surely, 2^23831281 is an apocalyptic number.

It is an amenable number.

23831281 is a deficient number, since it is larger than the sum of its proper divisors (768783).

23831281 is an equidigital number, since it uses as much as digits as its factorization.

23831281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 768782.

The product of its digits is 2304, while the sum is 28.

The square root of 23831281 is about 4881.7293042527. The cubic root of 23831281 is about 287.7723936333.

The spelling of 23831281 in words is "twenty-three million, eight hundred thirty-one thousand, two hundred eighty-one".