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BaseRepresentation
bin101110100010111
31012200122
411310113
51230311
6302155
7126323
oct56427
935618
1023831
11169a5
121195b
13ab02
148983
1570db
hex5d17

23831 has 2 divisors, whose sum is σ = 23832. Its totient is φ = 23830.

The previous prime is 23827. The next prime is 23833. The reversal of 23831 is 13832.

Subtracting from 23831 its reverse (13832), we obtain a palindrome (9999).

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 23831 - 22 = 23827 is a prime.

It is a super-2 number, since 2×238312 = 1135833122, which contains 22 as substring.

Together with 23833, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23833) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11915 + 11916.

It is an arithmetic number, because the mean of its divisors is an integer number (11916).

223831 is an apocalyptic number.

23831 is a deficient number, since it is larger than the sum of its proper divisors (1).

23831 is an equidigital number, since it uses as much as digits as its factorization.

23831 is an odious number, because the sum of its binary digits is odd.

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

The square root of 23831 is about 154.3729250873. The cubic root of 23831 is about 28.7771262566. Note that the first 3 decimals are identical.

The spelling of 23831 in words is "twenty-three thousand, eight hundred thirty-one".