18085189 has 2 divisors, whose sum is σ = 18085190. Its totient is φ = 18085188.

The previous prime is 18085163. The next prime is 18085213. The reversal of 18085189 is 98158081.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16564900 + 1520289 = 4070^2 + 1233^2 .

It is a cyclic number.

It is not a de Polignac number, because 18085189 - 2¹³ = 18076997 is a prime.

It is a super-2 number, since 2×18085189² = 654148122331442, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18085289) 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 as a sum of consecutive naturals, namely, 9042594 + 9042595.

It is an arithmetic number, because the mean of its divisors is an integer number (9042595).

Almost surely, 2^18085189 is an apocalyptic number.

It is an amenable number.

18085189 is a deficient number, since it is larger than the sum of its proper divisors (1).

18085189 is an equidigital number, since it uses as much as digits as its factorization.

18085189 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 23040, while the sum is 40.

The square root of 18085189 is about 4252.6684563930. The cubic root of 18085189 is about 262.4869302639.

The spelling of 18085189 in words is "eighteen million, eighty-five thousand, one hundred eighty-nine".