199190191 has 4 divisors (see below), whose sum is σ = 200644272. Its totient is φ = 197736112.

The previous prime is 199190153. The next prime is 199190219. The reversal of 199190191 is 191091991.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 199190191 - 2¹⁹ = 198665903 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (199190111) 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, 726835 + ... + 727108.

It is an arithmetic number, because the mean of its divisors is an integer number (50161068).

Almost surely, 2^199190191 is an apocalyptic number.

199190191 is a deficient number, since it is larger than the sum of its proper divisors (1454081).

199190191 is a wasteful number, since it uses less digits than its factorization.

199190191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1454080.

The product of its (nonzero) digits is 6561, while the sum is 40.

The square root of 199190191 is about 14113.4755110143. The cubic root of 199190191 is about 584.0131813110.

The spelling of 199190191 in words is "one hundred ninety-nine million, one hundred ninety thousand, one hundred ninety-one".