12515222 has 4 divisors (see below), whose sum is σ = 18772836. Its totient is φ = 6257610.

The previous prime is 12515203. The next prime is 12515311. The reversal of 12515222 is 22251521.

It is a happy number.

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

It is a junction number, because it is equal to n+sod(n) for n = 12515194 and 12515203.

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 3128804 + ... + 3128807.

It is an arithmetic number, because the mean of its divisors is an integer number (4693209).

Almost surely, 2^12515222 is an apocalyptic number.

12515222 is a deficient number, since it is larger than the sum of its proper divisors (6257614).

12515222 is an equidigital number, since it uses as much as digits as its factorization.

12515222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6257613.

The product of its digits is 400, while the sum is 20.

The square root of 12515222 is about 3537.6859668433. The cubic root of 12515222 is about 232.1736091535.

Adding to 12515222 its reverse (22251521), we get a palindrome (34766743).

The spelling of 12515222 in words is "twelve million, five hundred fifteen thousand, two hundred twenty-two".