199991088 has 60 divisors (see below), whose sum is σ = 610583688. Its totient is φ = 60602880.

The previous prime is 199991087. The next prime is 199991117. The reversal of 199991088 is 880199991.

It is not an unprimeable number, because it can be changed into a prime (199991087) 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, 61545 + ... + 64712.

Almost surely, 2^199991088 is an apocalyptic number.

199991088 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

199991088 is an abundant number, since it is smaller than the sum of its proper divisors (410592600).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

199991088 is a wasteful number, since it uses less digits than its factorization.

199991088 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 126282 (or 126273 counting only the distinct ones).

The product of its (nonzero) digits is 419904, while the sum is 54.

The square root of 199991088 is about 14141.8205334391. The cubic root of 199991088 is about 584.7948612315.

The spelling of 199991088 in words is "one hundred ninety-nine million, nine hundred ninety-one thousand, eighty-eight".