18116109 has 32 divisors (see below), whose sum is σ = 29527680. Its totient is φ = 10886400.

The previous prime is 18116107. The next prime is 18116129. The reversal of 18116109 is 90161181.

It is not a de Polignac number, because 18116109 - 2¹ = 18116107 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18116107) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 53589 + ... + 53925.

It is an arithmetic number, because the mean of its divisors is an integer number (922740).

Almost surely, 2^18116109 is an apocalyptic number.

It is an amenable number.

18116109 is a deficient number, since it is larger than the sum of its proper divisors (11411571).

18116109 is a wasteful number, since it uses less digits than its factorization.

18116109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 538 (or 532 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 27.

The square root of 18116109 is about 4256.3022684015. The cubic root of 18116109 is about 262.6364351975.

It can be divided in two parts, 18116 and 109, that added together give a square (18225 = 135²).

The spelling of 18116109 in words is "eighteen million, one hundred sixteen thousand, one hundred nine".