199044409 has 2 divisors, whose sum is σ = 199044410. Its totient is φ = 199044408.

The previous prime is 199044407. The next prime is 199044431. The reversal of 199044409 is 904440991.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 158760000 + 40284409 = 12600^2 + 6347^2 .

It is an emirp because it is prime and its reverse (904440991) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 199044409 - 2¹ = 199044407 is a prime.

Together with 199044407, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (199044401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99522204 + 99522205.

It is an arithmetic number, because the mean of its divisors is an integer number (99522205).

Almost surely, 2^199044409 is an apocalyptic number.

It is an amenable number.

199044409 is a deficient number, since it is larger than the sum of its proper divisors (1).

199044409 is an equidigital number, since it uses as much as digits as its factorization.

199044409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 46656, while the sum is 40.

The square root of 199044409 is about 14108.3099271316. The cubic root of 199044409 is about 583.8706719705.

The spelling of 199044409 in words is "one hundred ninety-nine million, forty-four thousand, four hundred nine".