9991198 has 24 divisors (see below), whose sum is σ = 17544600. Its totient is φ = 4254768.

The previous prime is 9991187. The next prime is 9991199. The reversal of 9991198 is 8911999.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9991199) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 26173 + ... + 26551.

It is an arithmetic number, because the mean of its divisors is an integer number (731025).

Almost surely, 2^9991198 is an apocalyptic number.

9991198 is a gapful number since it is divisible by the number (98) formed by its first and last digit.

9991198 is a deficient number, since it is larger than the sum of its proper divisors (7553402).

9991198 is a wasteful number, since it uses less digits than its factorization.

9991198 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 664 (or 657 counting only the distinct ones).

The product of its digits is 52488, while the sum is 46.

The square root of 9991198 is about 3160.8856353877. The cubic root of 9991198 is about 215.3802393342.

It can be divided in two parts, 999 and 1198, that added together give a cube (2197 = 13³).

The spelling of 9991198 in words is "nine million, nine hundred ninety-one thousand, one hundred ninety-eight".