23591 has 4 divisors (see below), whose sum is σ = 24384. Its totient is φ = 22800.

The previous prime is 23581. The next prime is 23593. The reversal of 23591 is 19532.

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

It is a cyclic number.

It is not a de Polignac number, because 23591 - 2¹⁰ = 22567 is a prime.

It is a Duffinian number.

It is a plaindrome in base 12.

It is a nialpdrome in base 14.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23593) 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, 350 + ... + 411.

It is an arithmetic number, because the mean of its divisors is an integer number (6096).

2²³⁵⁹¹ is an apocalyptic number.

23591 is a deficient number, since it is larger than the sum of its proper divisors (793).

23591 is an equidigital number, since it uses as much as digits as its factorization.

23591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 792.

The product of its digits is 270, while the sum is 20.

The square root of 23591 is about 153.5936196592. The cubic root of 23591 is about 28.6801961255.

The spelling of 23591 in words is "twenty-three thousand, five hundred ninety-one".