18089 has 2 divisors, whose sum is σ = 18090. Its totient is φ = 18088.

The previous prime is 18077. The next prime is 18097. The reversal of 18089 is 98081.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17689 + 400 = 133^2 + 20^2 .

It is an emirp because it is prime and its reverse (98081) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18089 is a prime.

It is a Chen prime.

It is a plaindrome in base 15.

It is not a weakly prime, because it can be changed into another prime (18049) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9044 + 9045.

It is an arithmetic number, because the mean of its divisors is an integer number (9045).

2¹⁸⁰⁸⁹ is an apocalyptic number.

It is an amenable number.

18089 is a deficient number, since it is larger than the sum of its proper divisors (1).

18089 is an equidigital number, since it uses as much as digits as its factorization.

18089 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 576, while the sum is 26.

The square root of 18089 is about 134.4953530796. The cubic root of 18089 is about 26.2505366481.

The spelling of 18089 in words is "eighteen thousand, eighty-nine".