195661597 has 2 divisors, whose sum is σ = 195661598. Its totient is φ = 195661596.

The previous prime is 195661577. The next prime is 195661603. The reversal of 195661597 is 795166591.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 119814916 + 75846681 = 10946^2 + 8709^2 .

It is an emirp because it is prime and its reverse (795166591) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-195661597 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 195661597.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (195661537) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97830798 + 97830799.

It is an arithmetic number, because the mean of its divisors is an integer number (97830799).

Almost surely, 2^195661597 is an apocalyptic number.

It is an amenable number.

195661597 is a deficient number, since it is larger than the sum of its proper divisors (1).

195661597 is an equidigital number, since it uses as much as digits as its factorization.

195661597 is an evil number, because the sum of its binary digits is even.

The product of its digits is 510300, while the sum is 49.

The square root of 195661597 is about 13987.9089573817. The cubic root of 195661597 is about 580.5440762643.

The spelling of 195661597 in words is "one hundred ninety-five million, six hundred sixty-one thousand, five hundred ninety-seven".