195975889 has 2 divisors, whose sum is σ = 195975890. Its totient is φ = 195975888.

The previous prime is 195975887. The next prime is 195975931. The reversal of 195975889 is 988579591.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 104448400 + 91527489 = 10220^2 + 9567^2 .

It is an emirp because it is prime and its reverse (988579591) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 195975889 - 2¹ = 195975887 is a prime.

Together with 195975887, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (195975887) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97987944 + 97987945.

It is an arithmetic number, because the mean of its divisors is an integer number (97987945).

Almost surely, 2^195975889 is an apocalyptic number.

It is an amenable number.

195975889 is a deficient number, since it is larger than the sum of its proper divisors (1).

195975889 is an equidigital number, since it uses as much as digits as its factorization.

195975889 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8164800, while the sum is 61.

The square root of 195975889 is about 13999.1388663732. The cubic root of 195975889 is about 580.8547533944.

The spelling of 195975889 in words is "one hundred ninety-five million, nine hundred seventy-five thousand, eight hundred eighty-nine".