18118169 has 2 divisors, whose sum is σ = 18118170. Its totient is φ = 18118168.

The previous prime is 18118157. The next prime is 18118183. The reversal of 18118169 is 96181181.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12334144 + 5784025 = 3512^2 + 2405^2 .

It is an emirp because it is prime and its reverse (96181181) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18118169 is a prime.

It is a super-2 number, since 2×18118169² = 656536095825122, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (18118109) 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 as a sum of consecutive naturals, namely, 9059084 + 9059085.

It is an arithmetic number, because the mean of its divisors is an integer number (9059085).

Almost surely, 2^18118169 is an apocalyptic number.

It is an amenable number.

18118169 is a deficient number, since it is larger than the sum of its proper divisors (1).

18118169 is an equidigital number, since it uses as much as digits as its factorization.

18118169 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3456, while the sum is 35.

The square root of 18118169 is about 4256.5442556139. The cubic root of 18118169 is about 262.6463896999.

The spelling of 18118169 in words is "eighteen million, one hundred eighteen thousand, one hundred sixty-nine".