196646687 has 2 divisors, whose sum is σ = 196646688. Its totient is φ = 196646686.

The previous prime is 196646683. The next prime is 196646689. The reversal of 196646687 is 786646691.

It is a strong prime.

It is an emirp because it is prime and its reverse (786646691) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 196646687 - 2² = 196646683 is a prime.

Together with 196646689, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (196646683) 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, 98323343 + 98323344.

It is an arithmetic number, because the mean of its divisors is an integer number (98323344).

Almost surely, 2^196646687 is an apocalyptic number.

196646687 is a deficient number, since it is larger than the sum of its proper divisors (1).

196646687 is an equidigital number, since it uses as much as digits as its factorization.

196646687 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2612736, while the sum is 53.

The square root of 196646687 is about 14023.0769448078. The cubic root of 196646687 is about 581.5167268232.

The spelling of 196646687 in words is "one hundred ninety-six million, six hundred forty-six thousand, six hundred eighty-seven".