991000000199 has 8 divisors (see below), whose sum is σ = 1085080177920. Its totient is φ = 897584700600.

The previous prime is 991000000181. The next prime is 991000000201.

It is a happy number.

991000000199 is nontrivially palindromic in base 10.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 991000000199 - 2²⁸ = 990731564743 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 (991000000129) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 166216409 + ... + 166222370.

It is an arithmetic number, because the mean of its divisors is an integer number (135635022240).

Almost surely, 2^991000000199 is an apocalyptic number.

991000000199 is a deficient number, since it is larger than the sum of its proper divisors (94080177721).

991000000199 is a wasteful number, since it uses less digits than its factorization.

991000000199 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 332439061.

The product of its (nonzero) digits is 6561, while the sum is 38.

It can be divided in two parts, 991000000 and 199, that added together give a palindrome (991000199).

The spelling of 991000000199 in words is "nine hundred ninety-one billion, one hundred ninety-nine", and thus it is an aban number.