195665947 has 2 divisors, whose sum is σ = 195665948. Its totient is φ = 195665946.

The previous prime is 195665849. The next prime is 195665963. The reversal of 195665947 is 749566591.

It is a strong prime.

It is an emirp because it is prime and its reverse (749566591) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 195665947 - 2¹⁹ = 195141659 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 195665894 and 195665903.

It is not a weakly prime, because it can be changed into another prime (195665047) 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, 97832973 + 97832974.

It is an arithmetic number, because the mean of its divisors is an integer number (97832974).

Almost surely, 2^195665947 is an apocalyptic number.

195665947 is a deficient number, since it is larger than the sum of its proper divisors (1).

195665947 is an equidigital number, since it uses as much as digits as its factorization.

195665947 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2041200, while the sum is 52.

The square root of 195665947 is about 13988.0644479499. The cubic root of 195665947 is about 580.5483785018.

The spelling of 195665947 in words is "one hundred ninety-five million, six hundred sixty-five thousand, nine hundred forty-seven".