13220825 has 6 divisors (see below), whose sum is σ = 16393854. Its totient is φ = 10576640.

The previous prime is 13220773. The next prime is 13220843. The reversal of 13220825 is 52802231.

It can be written as a sum of positive squares in 3 ways, for example, as 375769 + 12845056 = 613^2 + 3584^2 .

It is a de Polignac number, because none of the positive numbers 2^k-13220825 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 13220825.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 264392 + ... + 264441.

It is an arithmetic number, because the mean of its divisors is an integer number (2732309).

Almost surely, 2^13220825 is an apocalyptic number.

It is an amenable number.

13220825 is a deficient number, since it is larger than the sum of its proper divisors (3173029).

13220825 is an equidigital number, since it uses as much as digits as its factorization.

13220825 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 528843 (or 528838 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 23.

The square root of 13220825 is about 3636.0452417427. The cubic root of 13220825 is about 236.4573685760.

The spelling of 13220825 in words is "thirteen million, two hundred twenty thousand, eight hundred twenty-five".