It is a congruent number.
It is an unprimeable number.
Almost surely, 2999817216 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 999817216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1000340550).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
999817216 is an frugal number, since it uses more digits than its factorization.
999817216 is an evil number, because the sum of its binary digits is even.
The square root of 999817216 is about 31619.8864008080. The cubic root of 999817216 is about 999.9390682874.
The spelling of 999817216 in words is "nine hundred ninety-nine million, eight hundred seventeen thousand, two hundred sixteen".