18305009 has 2 divisors, whose sum is σ = 18305010. Its totient is φ = 18305008.

The previous prime is 18304997. The next prime is 18305029. The reversal of 18305009 is 90050381.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17875984 + 429025 = 4228^2 + 655^2 .

It is a cyclic number.

It is not a de Polignac number, because 18305009 - 2⁸ = 18304753 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (18305029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9152504 + 9152505.

It is an arithmetic number, because the mean of its divisors is an integer number (9152505).

Almost surely, 2^18305009 is an apocalyptic number.

It is an amenable number.

18305009 is a deficient number, since it is larger than the sum of its proper divisors (1).

18305009 is an equidigital number, since it uses as much as digits as its factorization.

18305009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1080, while the sum is 26.

The square root of 18305009 is about 4278.4353448428. The cubic root of 18305009 is about 263.5461334250.

The spelling of 18305009 in words is "eighteen million, three hundred five thousand, nine".