195643199 has 2 divisors, whose sum is σ = 195643200. Its totient is φ = 195643198.

The previous prime is 195643183. The next prime is 195643213. The reversal of 195643199 is 991346591.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 195643199 - 2⁴ = 195643183 is a prime.

It is a super-2 number, since 2×195643199² = 76552522629907202, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (195643169) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97821599 + 97821600.

It is an arithmetic number, because the mean of its divisors is an integer number (97821600).

Almost surely, 2^195643199 is an apocalyptic number.

195643199 is a deficient number, since it is larger than the sum of its proper divisors (1).

195643199 is an equidigital number, since it uses as much as digits as its factorization.

195643199 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 262440, while the sum is 47.

The square root of 195643199 is about 13987.2513025255. The cubic root of 195643199 is about 580.5258795667.

The spelling of 195643199 in words is "one hundred ninety-five million, six hundred forty-three thousand, one hundred ninety-nine".