195558197 has 2 divisors, whose sum is σ = 195558198. Its totient is φ = 195558196.

The previous prime is 195558173. The next prime is 195558217. The reversal of 195558197 is 791855591.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 105042001 + 90516196 = 10249^2 + 9514^2 .

It is a cyclic number.

It is not a de Polignac number, because 195558197 - 2⁶ = 195558133 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 (195555197) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97779098 + 97779099.

It is an arithmetic number, because the mean of its divisors is an integer number (97779099).

Almost surely, 2^195558197 is an apocalyptic number.

It is an amenable number.

195558197 is a deficient number, since it is larger than the sum of its proper divisors (1).

195558197 is an equidigital number, since it uses as much as digits as its factorization.

195558197 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 567000, while the sum is 50.

The square root of 195558197 is about 13984.2124197253. The cubic root of 195558197 is about 580.4417928052.

The spelling of 195558197 in words is "one hundred ninety-five million, five hundred fifty-eight thousand, one hundred ninety-seven".