199999069909 has 2 divisors, whose sum is σ = 199999069910. Its totient is φ = 199999069908.

The previous prime is 199999069901. The next prime is 199999069927. The reversal of 199999069909 is 909960999991.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 199607900625 + 391169284 = 446775^2 + 19778^2 .

It is an emirp because it is prime and its reverse (909960999991) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 199999069909 - 2³ = 199999069901 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (199999069901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99999534954 + 99999534955.

It is an arithmetic number, because the mean of its divisors is an integer number (99999534955).

Almost surely, 2^199999069909 is an apocalyptic number.

It is an amenable number.

199999069909 is a deficient number, since it is larger than the sum of its proper divisors (1).

199999069909 is an equidigital number, since it uses as much as digits as its factorization.

199999069909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 258280326, while the sum is 79.

The spelling of 199999069909 in words is "one hundred ninety-nine billion, nine hundred ninety-nine million, sixty-nine thousand, nine hundred nine".