999900111001 has 6 divisors (see below), whose sum is σ = 1099063758506. Its totient is φ = 909000100800.

The previous prime is 999900110971. The next prime is 999900111011. The reversal of 999900111001 is 100111009999.

It can be written as a sum of positive squares in only one way, i.e., 765058104976 + 234842006025 = 874676^2 + 484605^2 .

It is not a de Polignac number, because 999900111001 - 2⁵ = 999900110969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (999900111011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4131818520 + ... + 4131818761.

Almost surely, 2^999900111001 is an apocalyptic number.

It is an amenable number.

999900111001 is a deficient number, since it is larger than the sum of its proper divisors (99163647505).

999900111001 is a wasteful number, since it uses less digits than its factorization.

999900111001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8263637303 (or 8263637292 counting only the distinct ones).

The product of its (nonzero) digits is 6561, while the sum is 40.

The spelling of 999900111001 in words is "nine hundred ninety-nine billion, nine hundred million, one hundred eleven thousand, one".