12225555 has 24 divisors (see below), whose sum is σ = 21292128. Its totient is φ = 6489216.

The previous prime is 12225553. The next prime is 12225611. The reversal of 12225555 is 55552221.

It is not a de Polignac number, because 12225555 - 2¹ = 12225553 is a prime.

It is a plaindrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (12225553) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 11319 + ... + 12351.

It is an arithmetic number, because the mean of its divisors is an integer number (887172).

Almost surely, 2^12225555 is an apocalyptic number.

12225555 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

12225555 is a deficient number, since it is larger than the sum of its proper divisors (9066573).

12225555 is a wasteful number, since it uses less digits than its factorization.

12225555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1307 (or 1304 counting only the distinct ones).

The product of its digits is 5000, while the sum is 27.

The square root of 12225555 is about 3496.5061132508. The cubic root of 12225555 is about 230.3683762839.

Adding to 12225555 its reverse (55552221), we get a palindrome (67777776).

The spelling of 12225555 in words is "twelve million, two hundred twenty-five thousand, five hundred fifty-five".