196688909 has 2 divisors, whose sum is σ = 196688910. Its totient is φ = 196688908.

The previous prime is 196688867. The next prime is 196688911. The reversal of 196688909 is 909886691.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 100060009 + 96628900 = 10003^2 + 9830^2 .

It is a cyclic number.

It is not a de Polignac number, because 196688909 - 2¹⁶ = 196623373 is a prime.

It is a super-2 number, since 2×196688909² = 77373053847220562, which contains 22 as substring.

Together with 196688911, 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 (196681909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 98344454 + 98344455.

It is an arithmetic number, because the mean of its divisors is an integer number (98344455).

Almost surely, 2^196688909 is an apocalyptic number.

It is an amenable number.

196688909 is a deficient number, since it is larger than the sum of its proper divisors (1).

196688909 is an equidigital number, since it uses as much as digits as its factorization.

196688909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1679616, while the sum is 56.

The square root of 196688909 is about 14024.5823110708. The cubic root of 196688909 is about 581.5583429870.

The spelling of 196688909 in words is "one hundred ninety-six million, six hundred eighty-eight thousand, nine hundred nine".