13921225 has 6 divisors (see below), whose sum is σ = 17262350. Its totient is φ = 11136960.

The previous prime is 13921223. The next prime is 13921231. The reversal of 13921225 is 52212931.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 2611456 + 11309769 = 1616^2 + 3363^2 .

It is not a de Polignac number, because 13921225 - 2¹ = 13921223 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (25), and also a Moran number because the ratio is a prime number: 556849 = 13921225 / (1 + 3 + 9 + 2 + 1 + 2 + 2 + 5).

It is a self number, because there is not a number n which added to its sum of digits gives 13921225.

It is not an unprimeable number, because it can be changed into a prime (13921223) by changing a digit.

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 in 5 ways as a sum of consecutive naturals, for example, 278400 + ... + 278449.

Almost surely, 2^13921225 is an apocalyptic number.

It is an amenable number.

13921225 is a deficient number, since it is larger than the sum of its proper divisors (3341125).

13921225 is an equidigital number, since it uses as much as digits as its factorization.

13921225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 556859 (or 556854 counting only the distinct ones).

The product of its digits is 1080, while the sum is 25.

The square root of 13921225 is about 3731.1157848558. The cubic root of 13921225 is about 240.5613307681.

The spelling of 13921225 in words is "thirteen million, nine hundred twenty-one thousand, two hundred twenty-five".