12216625 has 16 divisors (see below), whose sum is σ = 16146000. Its totient is φ = 9196800.

The previous prime is 12216619. The next prime is 12216643. The reversal of 12216625 is 52661221.

12216625 = 2471² + 2472².

12216625 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 8 ways, for example, as 6105841 + 6110784 = 2471^2 + 2472^2 .

It is not a de Polignac number, because 12216625 - 2⁵ = 12216593 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a self number, because there is not a number n which added to its sum of digits gives 12216625.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 750 + ... + 4999.

It is an arithmetic number, because the mean of its divisors is an integer number (1009125).

Almost surely, 2^12216625 is an apocalyptic number.

12216625 is the 2472-nd centered square number.

It is an amenable number.

12216625 is a deficient number, since it is larger than the sum of its proper divisors (3929375).

12216625 is an equidigital number, since it uses as much as digits as its factorization.

12216625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5781 (or 5771 counting only the distinct ones).

The product of its digits is 1440, while the sum is 25.

The square root of 12216625 is about 3495.2288909312. The cubic root of 12216625 is about 230.3122727455.

Adding to 12216625 its reverse (52661221), we get a palindrome (64877846).

The spelling of 12216625 in words is "twelve million, two hundred sixteen thousand, six hundred twenty-five".