• Equal to 316212, 999887641 is almost surely the largest square with non-increasing digits (excluding trailing zeros).
The square root of 999887641 is 31621.
999887641 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.
It is a Duffinian number.
It is a nialpdrome in base 10.
It is a self number, because there is not a number n which added to its sum of digits gives 999887641.
Almost surely, 2999887641 is an apocalyptic number.
999887641 is the 31621-st square number.
999887641 is the 15811-st centered octagonal number.
It is an amenable number.
999887641 is an frugal number, since it uses more digits than its factorization.
999887641 is an odious number, because the sum of its binary digits is odd.
The cubic root of 999887641 is about 999.9625455972.
The spelling of 999887641 in words is "nine hundred ninety-nine million, eight hundred eighty-seven thousand, six hundred forty-one".