199992209 has 2 divisors, whose sum is σ = 199992210. Its totient is φ = 199992208.

The previous prime is 199992181. The next prime is 199992223. The reversal of 199992209 is 902299991.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 154132225 + 45859984 = 12415^2 + 6772^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-199992209 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (199992109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99996104 + 99996105.

It is an arithmetic number, because the mean of its divisors is an integer number (99996105).

Almost surely, 2^199992209 is an apocalyptic number.

It is an amenable number.

199992209 is a deficient number, since it is larger than the sum of its proper divisors (1).

199992209 is an equidigital number, since it uses as much as digits as its factorization.

199992209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 236196, while the sum is 50.

The square root of 199992209 is about 14141.8601676017. The cubic root of 199992209 is about 584.7959538699.

The spelling of 199992209 in words is "one hundred ninety-nine million, nine hundred ninety-two thousand, two hundred nine".