999100900000 has 288 divisors, whose sum is σ = 2827999246464. Its totient is φ = 340329600000.

The previous prime is 999100899971. The next prime is 999100900093. The reversal of 999100900000 is 9001999.

It is an unprimeable number.

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 47 ways as a sum of consecutive naturals, for example, 109895455 + ... + 109904545.

It is an arithmetic number, because the mean of its divisors is an integer number (9819441828).

Almost surely, 2^999100900000 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 999100900000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1413999623232).

999100900000 is an abundant number, since it is smaller than the sum of its proper divisors (1828898346464).

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

999100900000 is an equidigital number, since it uses as much as digits as its factorization.

999100900000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9290 (or 9262 counting only the distinct ones).

The product of its (nonzero) digits is 6561, while the sum is 37.

Adding to 999100900000 its reverse (9001999), we get a palindrome (999109901999).

The spelling of 999100900000 in words is "nine hundred ninety-nine billion, one hundred million, nine hundred thousand".