199065171 has 4 divisors (see below), whose sum is σ = 265420232. Its totient is φ = 132710112.

The previous prime is 199065137. The next prime is 199065197. The reversal of 199065171 is 171560991.

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

It is not a de Polignac number, because 199065171 - 2¹⁰ = 199064147 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (199065101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33177526 + ... + 33177531.

It is an arithmetic number, because the mean of its divisors is an integer number (66355058).

Almost surely, 2^199065171 is an apocalyptic number.

199065171 is a deficient number, since it is larger than the sum of its proper divisors (66355061).

199065171 is an equidigital number, since it uses as much as digits as its factorization.

199065171 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66355060.

The product of its (nonzero) digits is 17010, while the sum is 39.

The square root of 199065171 is about 14109.0457154267. The cubic root of 199065171 is about 583.8909721328.

It can be divided in two parts, 1990 and 65171, that added together give a triangular number (67161 = T₃₆₆).

The spelling of 199065171 in words is "one hundred ninety-nine million, sixty-five thousand, one hundred seventy-one".