199808117 has 4 divisors (see below), whose sum is σ = 199841760. Its totient is φ = 199774476.

The previous prime is 199808101. The next prime is 199808131. The reversal of 199808117 is 711808991.

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 a cyclic number.

It is not a de Polignac number, because 199808117 - 2⁴ = 199808101 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 (199808417) 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, 5267 + ... + 20672.

It is an arithmetic number, because the mean of its divisors is an integer number (49960440).

Almost surely, 2^199808117 is an apocalyptic number.

It is an amenable number.

199808117 is a deficient number, since it is larger than the sum of its proper divisors (33643).

199808117 is an equidigital number, since it uses as much as digits as its factorization.

199808117 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33642.

The product of its (nonzero) digits is 36288, while the sum is 44.

The square root of 199808117 is about 14135.3499072361. The cubic root of 199808117 is about 584.6164647012.

The spelling of 199808117 in words is "one hundred ninety-nine million, eight hundred eight thousand, one hundred seventeen".