199217 has 4 divisors (see below), whose sum is σ = 202020. Its totient is φ = 196416.

The previous prime is 199211. The next prime is 199247. The reversal of 199217 is 712991.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 712991 = 73 ⋅9767.

It can be written as a sum of positive squares in 2 ways, for example, as 160801 + 38416 = 401^2 + 196^2 .

It is a cyclic number.

It is not a de Polignac number, because 199217 - 2⁶ = 199153 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 199217.

It is not an unprimeable number, because it can be changed into a prime (199211) 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, 1292 + ... + 1437.

It is an arithmetic number, because the mean of its divisors is an integer number (50505).

2¹⁹⁹²¹⁷ is an apocalyptic number.

It is an amenable number.

199217 is a deficient number, since it is larger than the sum of its proper divisors (2803).

199217 is an equidigital number, since it uses as much as digits as its factorization.

199217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2802.

The product of its digits is 1134, while the sum is 29.

The square root of 199217 is about 446.3373163875. The cubic root of 199217 is about 58.4039380906.

The spelling of 199217 in words is "one hundred ninety-nine thousand, two hundred seventeen".