199848991 has 12 divisors (see below), whose sum is σ = 213455872. Its totient is φ = 187066368.

The previous prime is 199848983. The next prime is 199849019.

199848991 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 199848991 - 2³ = 199848983 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 (199848931) 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 11 ways as a sum of consecutive naturals, for example, 53986 + ... + 57568.

Almost surely, 2^199848991 is an apocalyptic number.

199848991 is a deficient number, since it is larger than the sum of its proper divisors (13606881).

199848991 is a wasteful number, since it uses less digits than its factorization.

199848991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3810 (or 3793 counting only the distinct ones).

The product of its digits is 1679616, while the sum is 58.

The square root of 199848991 is about 14136.7956411628. The cubic root of 199848991 is about 584.6563262519.

The spelling of 199848991 in words is "one hundred ninety-nine million, eight hundred forty-eight thousand, nine hundred ninety-one".