199471009 has 2 divisors, whose sum is σ = 199471010. Its totient is φ = 199471008.

The previous prime is 199471007. The next prime is 199471039. The reversal of 199471009 is 900174991.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 143640225 + 55830784 = 11985^2 + 7472^2 .

It is a cyclic number.

It is not a de Polignac number, because 199471009 - 2¹ = 199471007 is a prime.

Together with 199471007, 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 (199471001) 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, 99735504 + 99735505.

It is an arithmetic number, because the mean of its divisors is an integer number (99735505).

Almost surely, 2^199471009 is an apocalyptic number.

It is an amenable number.

199471009 is a deficient number, since it is larger than the sum of its proper divisors (1).

199471009 is an equidigital number, since it uses as much as digits as its factorization.

199471009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20412, while the sum is 40.

The square root of 199471009 is about 14123.4205842636. The cubic root of 199471009 is about 584.2874993775.

The spelling of 199471009 in words is "one hundred ninety-nine million, four hundred seventy-one thousand, nine".