195609857 has 2 divisors, whose sum is σ = 195609858. Its totient is φ = 195609856.

The previous prime is 195609853. The next prime is 195609863. The reversal of 195609857 is 758906591.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 179801281 + 15808576 = 13409^2 + 3976^2 .

It is an emirp because it is prime and its reverse (758906591) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 195609857 - 2² = 195609853 is a prime.

It is not a weakly prime, because it can be changed into another prime (195609853) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97804928 + 97804929.

It is an arithmetic number, because the mean of its divisors is an integer number (97804929).

Almost surely, 2^195609857 is an apocalyptic number.

It is an amenable number.

195609857 is a deficient number, since it is larger than the sum of its proper divisors (1).

195609857 is an equidigital number, since it uses as much as digits as its factorization.

195609857 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 680400, while the sum is 50.

The square root of 195609857 is about 13986.0593806833. The cubic root of 195609857 is about 580.4928994723.

The spelling of 195609857 in words is "one hundred ninety-five million, six hundred nine thousand, eight hundred fifty-seven".