199336409 has 2 divisors, whose sum is σ = 199336410. Its totient is φ = 199336408.

The previous prime is 199336387. The next prime is 199336421. The reversal of 199336409 is 904633991.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 197486809 + 1849600 = 14053^2 + 1360^2 .

It is an emirp because it is prime and its reverse (904633991) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 199336409 - 2²⁰ = 198287833 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 199336409.

It is not a weakly prime, because it can be changed into another prime (199336439) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99668204 + 99668205.

It is an arithmetic number, because the mean of its divisors is an integer number (99668205).

Almost surely, 2^199336409 is an apocalyptic number.

It is an amenable number.

199336409 is a deficient number, since it is larger than the sum of its proper divisors (1).

199336409 is an equidigital number, since it uses as much as digits as its factorization.

199336409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 157464, while the sum is 44.

The square root of 199336409 is about 14118.6546455390. The cubic root of 199336409 is about 584.1560470361.

The spelling of 199336409 in words is "one hundred ninety-nine million, three hundred thirty-six thousand, four hundred nine".