23381 has 4 divisors (see below), whose sum is σ = 23712. Its totient is φ = 23052.

The previous prime is 23371. The next prime is 23399. The reversal of 23381 is 18332.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 23381 - 2¹⁴ = 6997 is a prime.

It is a super-2 number, since 2×23381² = 1093342322, which contains 22 as substring.

It is a Duffinian number.

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 (23311) 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, 11 + ... + 216.

It is an arithmetic number, because the mean of its divisors is an integer number (5928).

2²³³⁸¹ is an apocalyptic number.

It is an amenable number.

23381 is a deficient number, since it is larger than the sum of its proper divisors (331).

23381 is a wasteful number, since it uses less digits than its factorization.

23381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 330.

The product of its digits is 144, while the sum is 17.

The square root of 23381 is about 152.9084693534. The cubic root of 23381 is about 28.5948415232.

It can be divided in two parts, 23 and 381, that added together give a palindrome (404).

The spelling of 23381 in words is "twenty-three thousand, three hundred eighty-one".