199648871 has 4 divisors (see below), whose sum is σ = 204291912. Its totient is φ = 195005832.

The previous prime is 199648853. The next prime is 199648877. The reversal of 199648871 is 178846991.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 178846991 = 139 ⋅1286669.

It is a cyclic number.

It is not a de Polignac number, because 199648871 - 2⁶ = 199648807 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 (199648877) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2321456 + ... + 2321541.

It is an arithmetic number, because the mean of its divisors is an integer number (51072978).

Almost surely, 2^199648871 is an apocalyptic number.

199648871 is a deficient number, since it is larger than the sum of its proper divisors (4643041).

199648871 is an equidigital number, since it uses as much as digits as its factorization.

199648871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4643040.

The product of its digits is 870912, while the sum is 53.

The square root of 199648871 is about 14129.7158853248. The cubic root of 199648871 is about 584.4611113573.

The spelling of 199648871 in words is "one hundred ninety-nine million, six hundred forty-eight thousand, eight hundred seventy-one".