16218589 has 4 divisors (see below), whose sum is σ = 16235100. Its totient is φ = 16202080.

The previous prime is 16218581. The next prime is 16218637. The reversal of 16218589 is 98581261.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 98581261 = 41 ⋅2404421.

It can be written as a sum of positive squares in 2 ways, for example, as 9406489 + 6812100 = 3067^2 + 2610^2 .

It is a cyclic number.

It is not a de Polignac number, because 16218589 - 2³ = 16218581 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16218581) 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, 6682 + ... + 8779.

It is an arithmetic number, because the mean of its divisors is an integer number (4058775).

Almost surely, 2^16218589 is an apocalyptic number.

It is an amenable number.

16218589 is a deficient number, since it is larger than the sum of its proper divisors (16511).

16218589 is a wasteful number, since it uses less digits than its factorization.

16218589 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16510.

The product of its digits is 34560, while the sum is 40.

The square root of 16218589 is about 4027.2309345256. The cubic root of 16218589 is about 253.1265438914.

It can be divided in two parts, 16218 and 589, that added together give a 5-th power (16807 = 7⁵).

The spelling of 16218589 in words is "sixteen million, two hundred eighteen thousand, five hundred eighty-nine".