18065909 has 2 divisors, whose sum is σ = 18065910. Its totient is φ = 18065908.

The previous prime is 18065897. The next prime is 18065911. The reversal of 18065909 is 90956081.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18037009 + 28900 = 4247^2 + 170^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18065909 is a prime.

It is a Sophie Germain prime.

Together with 18065911, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a plaindrome in base 15.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18065809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9032954 + 9032955.

It is an arithmetic number, because the mean of its divisors is an integer number (9032955).

Almost surely, 2^18065909 is an apocalyptic number.

It is an amenable number.

18065909 is a deficient number, since it is larger than the sum of its proper divisors (1).

18065909 is an equidigital number, since it uses as much as digits as its factorization.

18065909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 19440, while the sum is 38.

The square root of 18065909 is about 4250.4010399020. The cubic root of 18065909 is about 262.3936209921.

The spelling of 18065909 in words is "eighteen million, sixty-five thousand, nine hundred nine".