8287221 has 4 divisors (see below), whose sum is σ = 11049632. Its totient is φ = 5524812.

The previous prime is 8287171. The next prime is 8287229. The reversal of 8287221 is 1227828.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 8287221 - 2⁷ = 8287093 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 (8287229) 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 3 ways as a sum of consecutive naturals, for example, 1381201 + ... + 1381206.

It is an arithmetic number, because the mean of its divisors is an integer number (2762408).

Almost surely, 2^8287221 is an apocalyptic number.

It is an amenable number.

8287221 is a deficient number, since it is larger than the sum of its proper divisors (2762411).

8287221 is a wasteful number, since it uses less digits than its factorization.

8287221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2762410.

The product of its digits is 3584, while the sum is 30.

The square root of 8287221 is about 2878.7533760293. The cubic root of 8287221 is about 202.3654219365.

The spelling of 8287221 in words is "eight million, two hundred eighty-seven thousand, two hundred twenty-one".