199280191 has 8 divisors (see below), whose sum is σ = 217507968. Its totient is φ = 181071000.

The previous prime is 199280153. The next prime is 199280201. The reversal of 199280191 is 191082991.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 199280191 - 2⁹ = 199279679 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 (199280101) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27456 + ... + 33946.

It is an arithmetic number, because the mean of its divisors is an integer number (27188496).

Almost surely, 2^199280191 is an apocalyptic number.

199280191 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

199280191 is a deficient number, since it is larger than the sum of its proper divisors (18227777).

199280191 is a wasteful number, since it uses less digits than its factorization.

199280191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9293.

The product of its (nonzero) digits is 11664, while the sum is 40.

The square root of 199280191 is about 14116.6635930733. The cubic root of 199280191 is about 584.1011261905.

The spelling of 199280191 in words is "one hundred ninety-nine million, two hundred eighty thousand, one hundred ninety-one".