12551222 has 4 divisors (see below), whose sum is σ = 18826836. Its totient is φ = 6275610.

The previous prime is 12551213. The next prime is 12551239. The reversal of 12551222 is 22215521.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 22215521 = 2029 ⋅10949.

It is a junction number, because it is equal to n+sod(n) for n = 12551194 and 12551203.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3137804 + ... + 3137807.

It is an arithmetic number, because the mean of its divisors is an integer number (4706709).

Almost surely, 2^12551222 is an apocalyptic number.

12551222 is a deficient number, since it is larger than the sum of its proper divisors (6275614).

12551222 is an equidigital number, since it uses as much as digits as its factorization.

12551222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6275613.

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

The square root of 12551222 is about 3542.7703848824. The cubic root of 12551222 is about 232.3960116154.

Adding to 12551222 its reverse (22215521), we get a palindrome (34766743).

The spelling of 12551222 in words is "twelve million, five hundred fifty-one thousand, two hundred twenty-two".