18094009 has 2 divisors, whose sum is σ = 18094010. Its totient is φ = 18094008.

The previous prime is 18094007. The next prime is 18094033. The reversal of 18094009 is 90049081.

18094009 is nontrivially palindromic in base 11.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18020025 + 73984 = 4245^2 + 272^2 .

It is an emirp because it is prime and its reverse (90049081) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18094009 - 2¹ = 18094007 is a prime.

Together with 18094007, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (18094007) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9047004 + 9047005.

It is an arithmetic number, because the mean of its divisors is an integer number (9047005).

Almost surely, 2^18094009 is an apocalyptic number.

It is an amenable number.

18094009 is a deficient number, since it is larger than the sum of its proper divisors (1).

18094009 is an equidigital number, since it uses as much as digits as its factorization.

18094009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2592, while the sum is 31.

The square root of 18094009 is about 4253.7053259482. The cubic root of 18094009 is about 262.5295942447.

The spelling of 18094009 in words is "eighteen million, ninety-four thousand, nine".