195643169 has 2 divisors, whose sum is σ = 195643170. Its totient is φ = 195643168.

The previous prime is 195643141. The next prime is 195643181. The reversal of 195643169 is 961346591.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 105165025 + 90478144 = 10255^2 + 9512^2 .

It is a cyclic number.

It is not a de Polignac number, because 195643169 - 2⁸ = 195642913 is a prime.

It is a super-2 number, since 2×195643169² = 76552499152725122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (195643199) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97821584 + 97821585.

It is an arithmetic number, because the mean of its divisors is an integer number (97821585).

Almost surely, 2^195643169 is an apocalyptic number.

It is an amenable number.

195643169 is a deficient number, since it is larger than the sum of its proper divisors (1).

195643169 is an equidigital number, since it uses as much as digits as its factorization.

195643169 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 174960, while the sum is 44.

The square root of 195643169 is about 13987.2502301203. The cubic root of 195643169 is about 580.5258498941.

The spelling of 195643169 in words is "one hundred ninety-five million, six hundred forty-three thousand, one hundred sixty-nine".