199105 has 4 divisors (see below), whose sum is σ = 238932. Its totient is φ = 159280.

The previous prime is 199103. The next prime is 199109. The reversal of 199105 is 501991.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 501991 = 7 ⋅71713.

It can be written as a sum of positive squares in 2 ways, for example, as 101761 + 97344 = 319^2 + 312^2 .

It is not a de Polignac number, because 199105 - 2¹ = 199103 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 199105.

It is not an unprimeable number, because it can be changed into a prime (199103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19906 + ... + 19915.

It is an arithmetic number, because the mean of its divisors is an integer number (59733).

2¹⁹⁹¹⁰⁵ is an apocalyptic number.

It is an amenable number.

199105 is a deficient number, since it is larger than the sum of its proper divisors (39827).

199105 is an equidigital number, since it uses as much as digits as its factorization.

199105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39826.

The product of its (nonzero) digits is 405, while the sum is 25.

The square root of 199105 is about 446.2118331017. The cubic root of 199105 is about 58.3929911211.

The spelling of 199105 in words is "one hundred ninety-nine thousand, one hundred five".