216559 has 4 divisors (see below), whose sum is σ = 247504. Its totient is φ = 185616.

The previous prime is 216553. The next prime is 216569. The reversal of 216559 is 955612.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 216559 - 2³ = 216551 is a prime.

It is a Duffinian number.

It is a plaindrome in base 16.

It is a nialpdrome in base 13.

It is a zygodrome in base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15462 + ... + 15475.

It is an arithmetic number, because the mean of its divisors is an integer number (61876).

2²¹⁶⁵⁵⁹ is an apocalyptic number.

216559 is a deficient number, since it is larger than the sum of its proper divisors (30945).

216559 is an equidigital number, since it uses as much as digits as its factorization.

216559 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30944.

The product of its digits is 2700, while the sum is 28.

The square root of 216559 is about 465.3590012023. The cubic root of 216559 is about 60.0517146730.

It can be divided in two parts, 2 and 16559, that added together give a palindrome (16561).

The spelling of 216559 in words is "two hundred sixteen thousand, five hundred fifty-nine".