195889697 has 2 divisors, whose sum is σ = 195889698. Its totient is φ = 195889696.

The previous prime is 195889679. The next prime is 195889699. The reversal of 195889697 is 796988591.

Together with previous prime (195889679) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 195888016 + 1681 = 13996^2 + 41^2 .

It is a cyclic number.

It is not a de Polignac number, because 195889697 - 2²² = 191695393 is a prime.

Together with 195889699, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (195889699) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97944848 + 97944849.

It is an arithmetic number, because the mean of its divisors is an integer number (97944849).

Almost surely, 2^195889697 is an apocalyptic number.

It is an amenable number.

195889697 is a deficient number, since it is larger than the sum of its proper divisors (1).

195889697 is an equidigital number, since it uses as much as digits as its factorization.

195889697 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9797760, while the sum is 62.

The square root of 195889697 is about 13996.0600527434. The cubic root of 195889697 is about 580.7695858182.

The spelling of 195889697 in words is "one hundred ninety-five million, eight hundred eighty-nine thousand, six hundred ninety-seven".