199997009 has 2 divisors, whose sum is σ = 199997010. Its totient is φ = 199997008.

The previous prime is 199997003. The next prime is 199997033. The reversal of 199997009 is 900799991.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 114490000 + 85507009 = 10700^2 + 9247^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-199997009 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (199997003) 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, 99998504 + 99998505.

It is an arithmetic number, because the mean of its divisors is an integer number (99998505).

Almost surely, 2^199997009 is an apocalyptic number.

It is an amenable number.

199997009 is a deficient number, since it is larger than the sum of its proper divisors (1).

199997009 is an equidigital number, since it uses as much as digits as its factorization.

199997009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 413343, while the sum is 53.

The square root of 199997009 is about 14142.0298755165. The cubic root of 199997009 is about 584.8006323824.

The spelling of 199997009 in words is "one hundred ninety-nine million, nine hundred ninety-seven thousand, nine".