195974197 has 2 divisors, whose sum is σ = 195974198. Its totient is φ = 195974196.

The previous prime is 195974179. The next prime is 195974209. The reversal of 195974197 is 791479591.

Together with previous prime (195974179) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 186076881 + 9897316 = 13641^2 + 3146^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-195974197 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (195974117) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97987098 + 97987099.

It is an arithmetic number, because the mean of its divisors is an integer number (97987099).

Almost surely, 2^195974197 is an apocalyptic number.

It is an amenable number.

195974197 is a deficient number, since it is larger than the sum of its proper divisors (1).

195974197 is an equidigital number, since it uses as much as digits as its factorization.

195974197 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 714420, while the sum is 52.

The square root of 195974197 is about 13999.0784339541. The cubic root of 195974197 is about 580.8530817448.

The spelling of 195974197 in words is "one hundred ninety-five million, nine hundred seventy-four thousand, one hundred ninety-seven".