195963091 has 2 divisors, whose sum is σ = 195963092. Its totient is φ = 195963090.

The previous prime is 195963077. The next prime is 195963113. The reversal of 195963091 is 190369591.

It is a weak prime.

It is an emirp because it is prime and its reverse (190369591) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 195963091 - 2⁹ = 195962579 is a prime.

It is not a weakly prime, because it can be changed into another prime (195963011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97981545 + 97981546.

It is an arithmetic number, because the mean of its divisors is an integer number (97981546).

Almost surely, 2^195963091 is an apocalyptic number.

195963091 is a deficient number, since it is larger than the sum of its proper divisors (1).

195963091 is an equidigital number, since it uses as much as digits as its factorization.

195963091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 65610, while the sum is 43.

The square root of 195963091 is about 13998.6817593658. The cubic root of 195963091 is about 580.8421090823.

The spelling of 195963091 in words is "one hundred ninety-five million, nine hundred sixty-three thousand, ninety-one".