199690009 has 2 divisors, whose sum is σ = 199690010. Its totient is φ = 199690008.

The previous prime is 199689989. The next prime is 199690013. The reversal of 199690009 is 900096991.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 195216784 + 4473225 = 13972^2 + 2115^2 .

It is an emirp because it is prime and its reverse (900096991) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 199690009 - 2⁵ = 199689977 is a prime.

It is not a weakly prime, because it can be changed into another prime (199690039) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99845004 + 99845005.

It is an arithmetic number, because the mean of its divisors is an integer number (99845005).

Almost surely, 2^199690009 is an apocalyptic number.

It is an amenable number.

199690009 is a deficient number, since it is larger than the sum of its proper divisors (1).

199690009 is an equidigital number, since it uses as much as digits as its factorization.

199690009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 39366, while the sum is 43.

The square root of 199690009 is about 14131.1715367127. The cubic root of 199690009 is about 584.5012516795.

The spelling of 199690009 in words is "one hundred ninety-nine million, six hundred ninety thousand, nine".