196640009 has 2 divisors, whose sum is σ = 196640010. Its totient is φ = 196640008.

The previous prime is 196639997. The next prime is 196640023. The reversal of 196640009 is 900046691.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 171610000 + 25030009 = 13100^2 + 5003^2 .

It is a cyclic number.

It is not a de Polignac number, because 196640009 - 2¹² = 196635913 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (196648009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 98320004 + 98320005.

It is an arithmetic number, because the mean of its divisors is an integer number (98320005).

Almost surely, 2^196640009 is an apocalyptic number.

It is an amenable number.

196640009 is a deficient number, since it is larger than the sum of its proper divisors (1).

196640009 is an equidigital number, since it uses as much as digits as its factorization.

196640009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11664, while the sum is 35.

The square root of 196640009 is about 14022.8388352716. The cubic root of 196640009 is about 581.5101440991.

The spelling of 196640009 in words is "one hundred ninety-six million, six hundred forty thousand, nine".