231318589 has 2 divisors, whose sum is σ = 231318590. Its totient is φ = 231318588.

The previous prime is 231318551. The next prime is 231318599. The reversal of 231318589 is 985813132.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 175562500 + 55756089 = 13250^2 + 7467^2 .

It is a cyclic number.

It is not a de Polignac number, because 231318589 - 2⁹ = 231318077 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231318509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115659294 + 115659295.

It is an arithmetic number, because the mean of its divisors is an integer number (115659295).

Almost surely, 2^231318589 is an apocalyptic number.

It is an amenable number.

231318589 is a deficient number, since it is larger than the sum of its proper divisors (1).

231318589 is an equidigital number, since it uses as much as digits as its factorization.

231318589 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 51840, while the sum is 40.

The square root of 231318589 is about 15209.1613509753. The cubic root of 231318589 is about 613.8611917293.

It can be divided in two parts, 2313 and 18589, that added together give a palindrome (20902).

The spelling of 231318589 in words is "two hundred thirty-one million, three hundred eighteen thousand, five hundred eighty-nine".