It is a tau number, because it is divible by the number of its divisors (32).
It is an unprimeable number.
Almost surely, 2999981056 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 999981056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (999998565).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
999981056 is an frugal number, since it uses more digits than its factorization.
999981056 is an evil number, because the sum of its binary digits is even.
The square root of 999981056 is about 31622.4770693252. The cubic root of 999981056 is about 999.9936852935.
The spelling of 999981056 in words is "nine hundred ninety-nine million, nine hundred eighty-one thousand, fifty-six".