199354909 has 4 divisors (see below), whose sum is σ = 214689916. Its totient is φ = 184019904.

The previous prime is 199354907. The next prime is 199354921. The reversal of 199354909 is 909453991.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 909453991 = 83 ⋅10957277.

It can be written as a sum of positive squares in 2 ways, for example, as 87946884 + 111408025 = 9378^2 + 10555^2 .

It is a cyclic number.

It is not a de Polignac number, because 199354909 - 2¹ = 199354907 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 (199354901) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7667484 + ... + 7667509.

It is an arithmetic number, because the mean of its divisors is an integer number (53672479).

Almost surely, 2^199354909 is an apocalyptic number.

It is an amenable number.

199354909 is a deficient number, since it is larger than the sum of its proper divisors (15335007).

199354909 is a wasteful number, since it uses less digits than its factorization.

199354909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15335006.

The product of its (nonzero) digits is 393660, while the sum is 49.

The square root of 199354909 is about 14119.3097919126. The cubic root of 199354909 is about 584.1741179154.

The spelling of 199354909 in words is "one hundred ninety-nine million, three hundred fifty-four thousand, nine hundred nine".