99991208 has 16 divisors (see below), whose sum is σ = 187723680. Its totient is φ = 49931568.

The previous prime is 99991207. The next prime is 99991237. The reversal of 99991208 is 80219999.

It is not an unprimeable number, because it can be changed into a prime (99991207) 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, 1010 + ... + 14177.

It is an arithmetic number, because the mean of its divisors is an integer number (11732730).

Almost surely, 2^99991208 is an apocalyptic number.

It is an amenable number.

99991208 is a deficient number, since it is larger than the sum of its proper divisors (87732472).

99991208 is a wasteful number, since it uses less digits than its factorization.

99991208 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16016 (or 16012 counting only the distinct ones).

The product of its (nonzero) digits is 104976, while the sum is 47.

The square root of 99991208 is about 9999.5603903372. The cubic root of 99991208 is about 464.1452800129.

The spelling of 99991208 in words is "ninety-nine million, nine hundred ninety-one thousand, two hundred eight".