8515222 has 4 divisors (see below), whose sum is σ = 12772836. Its totient is φ = 4257610.

The previous prime is 8515207. The next prime is 8515229. The reversal of 8515222 is 2225158.

8515222 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8515229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2128804 + ... + 2128807.

It is an arithmetic number, because the mean of its divisors is an integer number (3193209).

Almost surely, 2^8515222 is an apocalyptic number.

8515222 is a deficient number, since it is larger than the sum of its proper divisors (4257614).

8515222 is a wasteful number, since it uses less digits than its factorization.

8515222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4257613.

The product of its digits is 1600, while the sum is 25.

The square root of 8515222 is about 2918.0853311718. The cubic root of 8515222 is about 204.2045078455.

Subtracting from 8515222 its reverse (2225158), we obtain a square (6290064 = 2508²).

The spelling of 8515222 in words is "eight million, five hundred fifteen thousand, two hundred twenty-two".