9909999000 has 512 divisors, whose sum is σ = 38161843200. Its totient is φ = 2358720000.

The previous prime is 9909998981. The next prime is 9909999019. The reversal of 9909999000 is 9999099.

9909999000 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (9909998981) and next prime (9909999019).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a super Niven number, because it is divisible the sum of any subset of its (nonzero) digits.

It is a congruent number.

It is an unprimeable number.

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 127 ways as a sum of consecutive naturals, for example, 18116727 + ... + 18117273.

It is an arithmetic number, because the mean of its divisors is an integer number (74534850).

Almost surely, 2^9909999000 is an apocalyptic number.

9909999000 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 9909999000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19080921600).

9909999000 is an abundant number, since it is smaller than the sum of its proper divisors (28251844200).

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

9909999000 is a wasteful number, since it uses less digits than its factorization.

9909999000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 649 (or 629 counting only the distinct ones).

The product of its (nonzero) digits is 531441, while the sum is 54.

The square root of 9909999000 is about 99548.9778953054. The cubic root of 9909999000 is about 2147.9518262658.

It can be divided in two parts, 990999 and 9000, that added together give a palindrome (999999).

The spelling of 9909999000 in words is "nine billion, nine hundred nine million, nine hundred ninety-nine thousand".