8258221 has 4 divisors (see below), whose sum is σ = 8351100. Its totient is φ = 8165344.

The previous prime is 8258213. The next prime is 8258227. The reversal of 8258221 is 1228528.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1022121 + 7236100 = 1011^2 + 2690^2 .

It is a cyclic number.

It is not a de Polignac number, because 8258221 - 2³ = 8258213 is a prime.

It is a Duffinian number.

8258221 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 8258221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8258227) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 46306 + ... + 46483.

It is an arithmetic number, because the mean of its divisors is an integer number (2087775).

Almost surely, 2^8258221 is an apocalyptic number.

It is an amenable number.

8258221 is a deficient number, since it is larger than the sum of its proper divisors (92879).

8258221 is an equidigital number, since it uses as much as digits as its factorization.

8258221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92878.

The product of its digits is 2560, while the sum is 28.

The square root of 8258221 is about 2873.7120593407. The cubic root of 8258221 is about 202.1290959905.

The spelling of 8258221 in words is "eight million, two hundred fifty-eight thousand, two hundred twenty-one".