18955169 has 2 divisors, whose sum is σ = 18955170. Its totient is φ = 18955168.

The previous prime is 18955163. The next prime is 18955207. The reversal of 18955169 is 96155981.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10758400 + 8196769 = 3280^2 + 2863^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18955169 is a prime.

It is a super-2 number, since 2×18955169² = 718596863637122, which contains 22 as substring.

It is a Chen prime.

It is a nialpdrome in base 11.

It is not a weakly prime, because it can be changed into another prime (18955163) 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, 9477584 + 9477585.

It is an arithmetic number, because the mean of its divisors is an integer number (9477585).

Almost surely, 2^18955169 is an apocalyptic number.

It is an amenable number.

18955169 is a deficient number, since it is larger than the sum of its proper divisors (1).

18955169 is an equidigital number, since it uses as much as digits as its factorization.

18955169 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 97200, while the sum is 44.

The square root of 18955169 is about 4353.7534381267. The cubic root of 18955169 is about 266.6301274588.

The spelling of 18955169 in words is "eighteen million, nine hundred fifty-five thousand, one hundred sixty-nine".