13213225 has 9 divisors (see below), whose sum is σ = 16406967.
Its totient is φ = 10556040.
The previous prime is 13213159. The next prime is 13213229. The reversal of 13213225 is 52231231.
Adding to 13213225 its reverse (52231231), we get a palindrome (65444456).
The square root of 13213225 is 3635.
It is a perfect power (a square), and thus also a powerful number.
13213225 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 only one way, i.e., 4756761 + 8456464 = 2181^2 + 2908^2
It is not a de Polignac number, because 13213225 - 29 = 13212713 is a prime.
It is a Duffinian number.
It is not an unprimeable number, because it can be changed into a prime (13213229) by changing a digit.
It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 17812 + ... + 18538.
Almost surely, 213213225 is an apocalyptic number.
13213225 is the 3635-th square number.
13213225 is the 1818-th centered octagonal number.
It is an amenable number.
13213225 is a deficient number, since it is larger than the sum of its proper divisors (3193742).
13213225 is an frugal number, since it uses more digits than its factorization.
With its successor (13213226) it forms an eRAP, since the sums of their prime factors are consecutive (1464 and 1465).
13213225 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 1464 (or 732 counting only the distinct ones).
The product of its digits is 360, while the sum is 19.
The cubic root of 13213225 is about 236.4120506663.
The spelling of 13213225 in words is "thirteen million, two hundred thirteen thousand, two hundred twenty-five".