243589 has 2 divisors, whose sum is σ = 243590. Its totient is φ = 243588.

The previous prime is 243587. The next prime is 243613. The reversal of 243589 is 985342.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 134689 + 108900 = 367^2 + 330^2 .

It is a cyclic number.

It is not a de Polignac number, because 243589 - 2¹ = 243587 is a prime.

Together with 243587, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 243589.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (243583) 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, 121794 + 121795.

It is an arithmetic number, because the mean of its divisors is an integer number (121795).

2²⁴³⁵⁸⁹ is an apocalyptic number.

It is an amenable number.

243589 is a deficient number, since it is larger than the sum of its proper divisors (1).

243589 is an equidigital number, since it uses as much as digits as its factorization.

243589 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8640, while the sum is 31.

The square root of 243589 is about 493.5473634820. The cubic root of 243589 is about 62.4528925031.

It can be divided in two parts, 2 and 43589, that multiplied together give a palindrome (87178).

The spelling of 243589 in words is "two hundred forty-three thousand, five hundred eighty-nine".