991848199 has 4 divisors (see below), whose sum is σ = 992732536. Its totient is φ = 990963864.

The previous prime is 991848173. The next prime is 991848223.

991848199 is nontrivially palindromic in base 10.

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

It is a cyclic number.

It is not a de Polignac number, because 991848199 - 2¹³ = 991840007 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 (991848139) 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, 440484 + ... + 442729.

It is an arithmetic number, because the mean of its divisors is an integer number (248183134).

Almost surely, 2^991848199 is an apocalyptic number.

991848199 is a deficient number, since it is larger than the sum of its proper divisors (884337).

991848199 is a wasteful number, since it uses less digits than its factorization.

991848199 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 884336.

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

The square root of 991848199 is about 31493.6215605637. The cubic root of 991848199 is about 997.2753158388.

The spelling of 991848199 in words is "nine hundred ninety-one million, eight hundred forty-eight thousand, one hundred ninety-nine".