199305409 has 2 divisors, whose sum is σ = 199305410. Its totient is φ = 199305408.

The previous prime is 199305397. The next prime is 199305437. The reversal of 199305409 is 904503991.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 182331009 + 16974400 = 13503^2 + 4120^2 .

It is an emirp because it is prime and its reverse (904503991) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 199305409 - 2¹¹ = 199303361 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (199305499) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99652704 + 99652705.

It is an arithmetic number, because the mean of its divisors is an integer number (99652705).

Almost surely, 2^199305409 is an apocalyptic number.

It is an amenable number.

199305409 is a deficient number, since it is larger than the sum of its proper divisors (1).

199305409 is an equidigital number, since it uses as much as digits as its factorization.

199305409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 43740, while the sum is 40.

The square root of 199305409 is about 14117.5567645397. The cubic root of 199305409 is about 584.1257635965.

The spelling of 199305409 in words is "one hundred ninety-nine million, three hundred five thousand, four hundred nine".