231589 has 2 divisors, whose sum is σ = 231590. Its totient is φ = 231588.

The previous prime is 231571. The next prime is 231599. The reversal of 231589 is 985132.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 187489 + 44100 = 433^2 + 210^2 .

It is a cyclic number.

It is not a de Polignac number, because 231589 - 2⁷ = 231461 is a prime.

231589 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231529) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115794 + 115795.

It is an arithmetic number, because the mean of its divisors is an integer number (115795).

2²³¹⁵⁸⁹ is an apocalyptic number.

It is an amenable number.

231589 is a deficient number, since it is larger than the sum of its proper divisors (1).

231589 is an equidigital number, since it uses as much as digits as its factorization.

231589 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2160, while the sum is 28.

The square root of 231589 is about 481.2369478750. The cubic root of 231589 is about 61.4100299445.

It can be divided in two parts, 231 and 589, that added together give a triangular number (820 = T₄₀).

The spelling of 231589 in words is "two hundred thirty-one thousand, five hundred eighty-nine".