8321661 has 12 divisors (see below), whose sum is σ = 12300288. Its totient is φ = 5418504.

The previous prime is 8321657. The next prime is 8321683. The reversal of 8321661 is 1661238.

8321661 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 8321661 - 2² = 8321657 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8321611) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10365 + ... + 11138.

It is an arithmetic number, because the mean of its divisors is an integer number (1025024).

Almost surely, 2^8321661 is an apocalyptic number.

It is an amenable number.

8321661 is a deficient number, since it is larger than the sum of its proper divisors (3978627).

8321661 is a wasteful number, since it uses less digits than its factorization.

8321661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21552 (or 21549 counting only the distinct ones).

The product of its digits is 1728, while the sum is 27.

The square root of 8321661 is about 2884.7289300730. The cubic root of 8321661 is about 202.6453643041.

Adding to 8321661 its reverse (1661238), we get a palindrome (9982899).

The spelling of 8321661 in words is "eight million, three hundred twenty-one thousand, six hundred sixty-one".