195887191 has 2 divisors, whose sum is σ = 195887192. Its totient is φ = 195887190.

The previous prime is 195887149. The next prime is 195887239. The reversal of 195887191 is 191788591.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 195887191 - 2⁷ = 195887063 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (195887101) 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, 97943595 + 97943596.

It is an arithmetic number, because the mean of its divisors is an integer number (97943596).

Almost surely, 2^195887191 is an apocalyptic number.

195887191 is a deficient number, since it is larger than the sum of its proper divisors (1).

195887191 is an equidigital number, since it uses as much as digits as its factorization.

195887191 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 181440, while the sum is 49.

The square root of 195887191 is about 13995.9705272625. The cubic root of 195887191 is about 580.7671092292.

The spelling of 195887191 in words is "one hundred ninety-five million, eight hundred eighty-seven thousand, one hundred ninety-one".