195985397 has 2 divisors, whose sum is σ = 195985398. Its totient is φ = 195985396.

The previous prime is 195985381. The next prime is 195985421. The reversal of 195985397 is 793589591.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 130553476 + 65431921 = 11426^2 + 8089^2 .

It is an emirp because it is prime and its reverse (793589591) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 195985397 - 2⁴ = 195985381 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (195985897) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97992698 + 97992699.

It is an arithmetic number, because the mean of its divisors is an integer number (97992699).

Almost surely, 2^195985397 is an apocalyptic number.

It is an amenable number.

195985397 is a deficient number, since it is larger than the sum of its proper divisors (1).

195985397 is an equidigital number, since it uses as much as digits as its factorization.

195985397 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3061800, while the sum is 56.

The square root of 195985397 is about 13999.4784545711. The cubic root of 195985397 is about 580.8641468590.

The spelling of 195985397 in words is "one hundred ninety-five million, nine hundred eighty-five thousand, three hundred ninety-seven".