18186089 has 2 divisors, whose sum is σ = 18186090. Its totient is φ = 18186088.

The previous prime is 18186071. The next prime is 18186121. The reversal of 18186089 is 98068181.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15960025 + 2226064 = 3995^2 + 1492^2 .

It is an emirp because it is prime and its reverse (98068181) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18186089 - 2²⁴ = 1408873 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 (18183089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9093044 + 9093045.

It is an arithmetic number, because the mean of its divisors is an integer number (9093045).

Almost surely, 2^18186089 is an apocalyptic number.

It is an amenable number.

18186089 is a deficient number, since it is larger than the sum of its proper divisors (1).

18186089 is an equidigital number, since it uses as much as digits as its factorization.

18186089 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 27648, while the sum is 41.

The square root of 18186089 is about 4264.5150955296. The cubic root of 18186089 is about 262.9741766489.

The spelling of 18186089 in words is "eighteen million, one hundred eighty-six thousand, eighty-nine".