99191912 has 8 divisors (see below), whose sum is σ = 185984850. Its totient is φ = 49595952.

The previous prime is 99191903. The next prime is 99191933. The reversal of 99191912 is 21919199.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 88472836 + 10719076 = 9406^2 + 3274^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a self number, because there is not a number n which added to its sum of digits gives 99191912.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6199487 + ... + 6199502.

Almost surely, 2^99191912 is an apocalyptic number.

It is an amenable number.

99191912 is a deficient number, since it is larger than the sum of its proper divisors (86792938).

99191912 is a wasteful number, since it uses less digits than its factorization.

99191912 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12398995 (or 12398991 counting only the distinct ones).

The product of its digits is 13122, while the sum is 41.

The square root of 99191912 is about 9959.5136427438. The cubic root of 99191912 is about 462.9052296518.

The spelling of 99191912 in words is "ninety-nine million, one hundred ninety-one thousand, nine hundred twelve".