8221591 has 16 divisors (see below), whose sum is σ = 10126080. Its totient is φ = 6514560.

The previous prime is 8221589. The next prime is 8221597. The reversal of 8221591 is 1951228.

It is a cyclic number.

It is not a de Polignac number, because 8221591 - 2¹ = 8221589 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8221597) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6436 + ... + 7606.

It is an arithmetic number, because the mean of its divisors is an integer number (632880).

Almost surely, 2^8221591 is an apocalyptic number.

8221591 is a deficient number, since it is larger than the sum of its proper divisors (1904489).

8221591 is a wasteful number, since it uses less digits than its factorization.

8221591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1254.

The product of its digits is 1440, while the sum is 28.

The square root of 8221591 is about 2867.3316864290. The cubic root of 8221591 is about 201.8297997766.

The spelling of 8221591 in words is "eight million, two hundred twenty-one thousand, five hundred ninety-one".