199219009 has 16 divisors (see below), whose sum is σ = 236664000. Its totient is φ = 165654720.

The previous prime is 199218991. The next prime is 199219019. The reversal of 199219009 is 900912991.

199219009 = 2441² + 2442² + ... + 2473².

It is not a de Polignac number, because 199219009 - 2²³ = 190830401 is a prime.

It is not an unprimeable number, because it can be changed into a prime (199219019) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10374 + ... + 22495.

It is an arithmetic number, because the mean of its divisors is an integer number (14791500).

Almost surely, 2^199219009 is an apocalyptic number.

199219009 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

199219009 is a deficient number, since it is larger than the sum of its proper divisors (37444991).

199219009 is a wasteful number, since it uses less digits than its factorization.

199219009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32928.

The product of its (nonzero) digits is 13122, while the sum is 40.

The square root of 199219009 is about 14114.4964132625. The cubic root of 199219009 is about 584.0413441440.

The spelling of 199219009 in words is "one hundred ninety-nine million, two hundred nineteen thousand, nine".