8621 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.
It is a semiprime because it is the product of two primes.
It is a cyclic number.
It is a de Polignac number, because none of the positive numbers 2k-8621 is a prime.
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 8621.
It is a congruent number.
28621 is an apocalyptic number.
It is an amenable number.
8621 is a wasteful number, since it uses less digits than its factorization.
8621 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 270.
The square root of 8621 is about 92.8493403315. The cubic root of 8621 is about 20.5046588658.
Adding to 8621 its reverse (1268), we get a palindrome (9889).
The spelling of 8621 in words is "eight thousand, six hundred twenty-one".