196646689 has 2 divisors, whose sum is σ = 196646690. Its totient is φ = 196646688.

The previous prime is 196646687. The next prime is 196646699. The reversal of 196646689 is 986646691.

196646689 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 167573025 + 29073664 = 12945^2 + 5392^2 .

It is an emirp because it is prime and its reverse (986646691) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 196646689 - 2¹ = 196646687 is a prime.

Together with 196646687, 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 (196646683) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 98323344 + 98323345.

It is an arithmetic number, because the mean of its divisors is an integer number (98323345).

Almost surely, 2^196646689 is an apocalyptic number.

It is an amenable number.

196646689 is a deficient number, since it is larger than the sum of its proper divisors (1).

196646689 is an equidigital number, since it uses as much as digits as its factorization.

196646689 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3359232, while the sum is 55.

The square root of 196646689 is about 14023.0770161188. The cubic root of 196646689 is about 581.5167287947.

The spelling of 196646689 in words is "one hundred ninety-six million, six hundred forty-six thousand, six hundred eighty-nine".