23431 has 2 divisors, whose sum is σ = 23432. Its totient is φ = 23430.

The previous prime is 23417. The next prime is 23447. The reversal of 23431 is 13432.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 23431 - 2⁵ = 23399 is a prime.

It is a super-2 number, since 2×23431² = 1098023522, which contains 22 as substring.

It is a nialpdrome in base 13.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11715 + 11716.

It is an arithmetic number, because the mean of its divisors is an integer number (11716).

2²³⁴³¹ is an apocalyptic number.

23431 is a deficient number, since it is larger than the sum of its proper divisors (1).

23431 is an equidigital number, since it uses as much as digits as its factorization.

23431 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 72, while the sum is 13.

The square root of 23431 is about 153.0718785408. The cubic root of 23431 is about 28.6152102574.

Adding to 23431 its reverse (13432), we get a palindrome (36863).

Subtracting from 23431 its reverse (13432), we obtain a palindrome (9999).

It can be divided in two parts, 23 and 431, that added together give a palindrome (454).

The spelling of 23431 in words is "twenty-three thousand, four hundred thirty-one".