199999069901 has 2 divisors, whose sum is σ = 199999069902. Its totient is φ = 199999069900.

The previous prime is 199999069883. The next prime is 199999069909. The reversal of 199999069901 is 109960999991.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 188465383876 + 11533686025 = 434126^2 + 107395^2 .

It is an emirp because it is prime and its reverse (109960999991) is a distict prime. It is also a bemirp because it and its reverse can be mirrored producing other two distinct primes, 106690666661 and 166666096601.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-199999069901 is a prime.

It is a super-2 number, since 2×199999069901² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (199999069909) 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, 99999534950 + 99999534951.

It is an arithmetic number, because the mean of its divisors is an integer number (99999534951).

Almost surely, 2^199999069901 is an apocalyptic number.

It is an amenable number.

199999069901 is a deficient number, since it is larger than the sum of its proper divisors (1).

199999069901 is an equidigital number, since it uses as much as digits as its factorization.

199999069901 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 28697814, while the sum is 71.

The spelling of 199999069901 in words is "one hundred ninety-nine billion, nine hundred ninety-nine million, sixty-nine thousand, nine hundred one".