199009 has 4 divisors (see below), whose sum is σ = 200704. Its totient is φ = 197316.

The previous prime is 198997. The next prime is 199021. The reversal of 199009 is 900991.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (198997) and next prime (199021).

It is a cyclic number.

It is not a de Polignac number, because 199009 - 2⁵ = 198977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (199039) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 657 + ... + 910.

It is an arithmetic number, because the mean of its divisors is an integer number (50176).

2¹⁹⁹⁰⁰⁹ is an apocalyptic number.

It is an amenable number.

199009 is a deficient number, since it is larger than the sum of its proper divisors (1695).

199009 is a wasteful number, since it uses less digits than its factorization.

199009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1694.

The product of its (nonzero) digits is 729, while the sum is 28.

The square root of 199009 is about 446.1042479062. The cubic root of 199009 is about 58.3836047364.

It can be divided in two parts, 19 and 9009, that multiplied together give a palindrome (171171).

The spelling of 199009 in words is "one hundred ninety-nine thousand, nine".