23791 has 4 divisors (see below), whose sum is σ = 24472. Its totient is φ = 23112.

The previous prime is 23789. The next prime is 23801. The reversal of 23791 is 19732.

23791 = 5² + 6² + ... + 41².

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 23791 - 2¹ = 23789 is a prime.

It is a Duffinian number.

It is a plaindrome in base 16.

It is a nialpdrome in base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23741) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 285 + ... + 358.

It is an arithmetic number, because the mean of its divisors is an integer number (6118).

2²³⁷⁹¹ is an apocalyptic number.

23791 is a deficient number, since it is larger than the sum of its proper divisors (681).

23791 is an equidigital number, since it uses as much as digits as its factorization.

23791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 680.

The product of its digits is 378, while the sum is 22.

The square root of 23791 is about 154.2433142797. The cubic root of 23791 is about 28.7610165720.

Multiplying 23791 by its product of digits (378), we get a palindrome (8992998).

The spelling of 23791 in words is "twenty-three thousand, seven hundred ninety-one".