18195169 has 2 divisors, whose sum is σ = 18195170. Its totient is φ = 18195168.

The previous prime is 18195161. The next prime is 18195173. The reversal of 18195169 is 96159181.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14630625 + 3564544 = 3825^2 + 1888^2 .

It is an emirp because it is prime and its reverse (96159181) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18195169 - 2³ = 18195161 is a prime.

It is a super-2 number, since 2×18195169² = 662128349877122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (18195161) 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, 9097584 + 9097585.

It is an arithmetic number, because the mean of its divisors is an integer number (9097585).

Almost surely, 2^18195169 is an apocalyptic number.

It is an amenable number.

18195169 is a deficient number, since it is larger than the sum of its proper divisors (1).

18195169 is an equidigital number, since it uses as much as digits as its factorization.

18195169 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 19440, while the sum is 40.

The square root of 18195169 is about 4265.5795620291. The cubic root of 18195169 is about 263.0179355211.

The spelling of 18195169 in words is "eighteen million, one hundred ninety-five thousand, one hundred sixty-nine".