18000089 has 2 divisors, whose sum is σ = 18000090. Its totient is φ = 18000088.

The previous prime is 18000067. The next prime is 18000137. The reversal of 18000089 is 98000081.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17347225 + 652864 = 4165^2 + 808^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18000089 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (18000889) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9000044 + 9000045.

It is an arithmetic number, because the mean of its divisors is an integer number (9000045).

Almost surely, 2^18000089 is an apocalyptic number.

It is an amenable number.

18000089 is a deficient number, since it is larger than the sum of its proper divisors (1).

18000089 is an equidigital number, since it uses as much as digits as its factorization.

18000089 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 18000089 is about 4242.6511758569. The cubic root of 18000089 is about 262.0745713572.

The spelling of 18000089 in words is "eighteen million, eighty-nine", and thus it is an aban number and an uban number.