999100899999 has 32 divisors (see below), whose sum is σ = 1520604887040. Its totient is φ = 647873025696.

The previous prime is 999100899971. The next prime is 999100900093. The reversal of 999100899999 is 999998001999.

It is not a de Polignac number, because 999100899999 - 2¹⁶ = 999100834463 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (999100899299) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3256822 + ... + 3550364.

It is an arithmetic number, because the mean of its divisors is an integer number (47518902720).

Almost surely, 2^999100899999 is an apocalyptic number.

999100899999 is a deficient number, since it is larger than the sum of its proper divisors (521503987041).

999100899999 is a wasteful number, since it uses less digits than its factorization.

999100899999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 296996 (or 296990 counting only the distinct ones).

The product of its (nonzero) digits is 344373768, while the sum is 81.

The spelling of 999100899999 in words is "nine hundred ninety-nine billion, one hundred million, eight hundred ninety-nine thousand, nine hundred ninety-nine".