199565109 has 12 divisors (see below), whose sum is σ = 288386956. Its totient is φ = 132985152.

The previous prime is 199565101. The next prime is 199565123. The reversal of 199565109 is 901565991.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 24532209 + 175032900 = 4953^2 + 13230^2 .

It is not a de Polignac number, because 199565109 - 2³ = 199565101 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (199565101) 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 in 11 ways as a sum of consecutive naturals, for example, 30039 + ... + 36075.

Almost surely, 2^199565109 is an apocalyptic number.

It is an amenable number.

199565109 is a deficient number, since it is larger than the sum of its proper divisors (88821847).

199565109 is a wasteful number, since it uses less digits than its factorization.

199565109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9716 (or 9713 counting only the distinct ones).

The product of its (nonzero) digits is 109350, while the sum is 45.

The square root of 199565109 is about 14126.7515374201. The cubic root of 199565109 is about 584.3793637048.

The spelling of 199565109 in words is "one hundred ninety-nine million, five hundred sixty-five thousand, one hundred nine".