231839 has 2 divisors, whose sum is σ = 231840. Its totient is φ = 231838.

The previous prime is 231827. The next prime is 231841. The reversal of 231839 is 938132.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 231839 - 2⁴ = 231823 is a prime.

It is a Sophie Germain prime.

Together with 231841, it forms a pair of twin primes.

It is a Chen prime.

It is a plaindrome in base 16.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231809) 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 as a sum of consecutive naturals, namely, 115919 + 115920.

It is an arithmetic number, because the mean of its divisors is an integer number (115920).

2²³¹⁸³⁹ is an apocalyptic number.

231839 is a deficient number, since it is larger than the sum of its proper divisors (1).

231839 is an equidigital number, since it uses as much as digits as its factorization.

231839 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1296, while the sum is 26.

The square root of 231839 is about 481.4966251180. The cubic root of 231839 is about 61.4321193449.

The spelling of 231839 in words is "two hundred thirty-one thousand, eight hundred thirty-nine".