18107009 has 2 divisors, whose sum is σ = 18107010. Its totient is φ = 18107008.

The previous prime is 18106997. The next prime is 18107017. The reversal of 18107009 is 90070181.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11242609 + 6864400 = 3353^2 + 2620^2 .

It is an emirp because it is prime and its reverse (90070181) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18107009 - 2¹² = 18102913 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (18107039) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9053504 + 9053505.

It is an arithmetic number, because the mean of its divisors is an integer number (9053505).

Almost surely, 2^18107009 is an apocalyptic number.

It is an amenable number.

18107009 is a deficient number, since it is larger than the sum of its proper divisors (1).

18107009 is an equidigital number, since it uses as much as digits as its factorization.

18107009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 504, while the sum is 26.

The square root of 18107009 is about 4255.2331310987. The cubic root of 18107009 is about 262.5924523929.

The spelling of 18107009 in words is "eighteen million, one hundred seven thousand, nine".