23881565 has 4 divisors (see below), whose sum is σ = 28657884. Its totient is φ = 19105248.

The previous prime is 23881553. The next prime is 23881577. The reversal of 23881565 is 56518832.

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

It is an interprime number because it is at equal distance from previous prime (23881553) and next prime (23881577).

It can be written as a sum of positive squares in 2 ways, for example, as 15155449 + 8726116 = 3893^2 + 2954^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-23881565 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2388152 + ... + 2388161.

It is an arithmetic number, because the mean of its divisors is an integer number (7164471).

Almost surely, 2^23881565 is an apocalyptic number.

It is an amenable number.

23881565 is a deficient number, since it is larger than the sum of its proper divisors (4776319).

23881565 is an equidigital number, since it uses as much as digits as its factorization.

23881565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4776318.

The product of its digits is 57600, while the sum is 38.

The square root of 23881565 is about 4886.8768144900. The cubic root of 23881565 is about 287.9746513505.

The spelling of 23881565 in words is "twenty-three million, eight hundred eighty-one thousand, five hundred sixty-five".