196638329 has 2 divisors, whose sum is σ = 196638330. Its totient is φ = 196638328.

The previous prime is 196638317. The next prime is 196638331. The reversal of 196638329 is 923836691.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 133356304 + 63282025 = 11548^2 + 7955^2 .

It is a cyclic number.

It is not a de Polignac number, because 196638329 - 2¹⁶ = 196572793 is a prime.

Together with 196638331, 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 (196638359) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 98319164 + 98319165.

It is an arithmetic number, because the mean of its divisors is an integer number (98319165).

Almost surely, 2^196638329 is an apocalyptic number.

It is an amenable number.

196638329 is a deficient number, since it is larger than the sum of its proper divisors (1).

196638329 is an equidigital number, since it uses as much as digits as its factorization.

196638329 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 419904, while the sum is 47.

The square root of 196638329 is about 14022.7789328649. The cubic root of 196638329 is about 581.5084880444.

The spelling of 196638329 in words is "one hundred ninety-six million, six hundred thirty-eight thousand, three hundred twenty-nine".