18116609 has 4 divisors (see below), whose sum is σ = 20704704. Its totient is φ = 15528516.

The previous prime is 18116597. The next prime is 18116653. The reversal of 18116609 is 90661181.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 18116609 - 2⁸ = 18116353 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18116669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1294037 + ... + 1294050.

It is an arithmetic number, because the mean of its divisors is an integer number (5176176).

Almost surely, 2^18116609 is an apocalyptic number.

It is an amenable number.

18116609 is a deficient number, since it is larger than the sum of its proper divisors (2588095).

18116609 is an equidigital number, since it uses as much as digits as its factorization.

18116609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2588094.

The product of its (nonzero) digits is 2592, while the sum is 32.

The square root of 18116609 is about 4256.3610044262. The cubic root of 18116609 is about 262.6388514082.

The spelling of 18116609 in words is "eighteen million, one hundred sixteen thousand, six hundred nine".