8221565 has 16 divisors (see below), whose sum is σ = 10898496. Its totient is φ = 5904000.

The previous prime is 8221561. The next prime is 8221567. The reversal of 8221565 is 5651228.

8221565 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 8221565 - 2² = 8221561 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 (8221561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3665 + ... + 5465.

It is an arithmetic number, because the mean of its divisors is an integer number (681156).

Almost surely, 2^8221565 is an apocalyptic number.

It is an amenable number.

8221565 is a deficient number, since it is larger than the sum of its proper divisors (2676931).

8221565 is a wasteful number, since it uses less digits than its factorization.

8221565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1900.

The product of its digits is 4800, while the sum is 29.

The square root of 8221565 is about 2867.3271525935. The cubic root of 8221565 is about 201.8295870205.

The spelling of 8221565 in words is "eight million, two hundred twenty-one thousand, five hundred sixty-five".