216589 has 4 divisors (see below), whose sum is σ = 220320. Its totient is φ = 212860.

The previous prime is 216577. The next prime is 216607. The reversal of 216589 is 985612.

216589 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 216589 - 2¹¹ = 214541 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a plaindrome in base 13.

It is a nialpdrome in base 12.

It is a self number, because there is not a number n which added to its sum of digits gives 216589.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216509) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1777 + ... + 1894.

It is an arithmetic number, because the mean of its divisors is an integer number (55080).

2²¹⁶⁵⁸⁹ is an apocalyptic number.

It is an amenable number.

216589 is a deficient number, since it is larger than the sum of its proper divisors (3731).

216589 is an equidigital number, since it uses as much as digits as its factorization.

216589 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3730.

The product of its digits is 4320, while the sum is 31.

The square root of 216589 is about 465.3912332651. The cubic root of 216589 is about 60.0544875405.

The spelling of 216589 in words is "two hundred sixteen thousand, five hundred eighty-nine".