13151225 has 6 divisors (see below), whose sum is σ = 16307550. Its totient is φ = 10520960.

The previous prime is 13151197. The next prime is 13151227. The reversal of 13151225 is 52215131.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 162409 + 12988816 = 403^2 + 3604^2 .

It is a de Polignac number, because none of the positive numbers 2^k-13151225 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 13151197 and 13151206.

It is not an unprimeable number, because it can be changed into a prime (13151227) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 263000 + ... + 263049.

It is an arithmetic number, because the mean of its divisors is an integer number (2717925).

Almost surely, 2^13151225 is an apocalyptic number.

It is an amenable number.

13151225 is a deficient number, since it is larger than the sum of its proper divisors (3156325).

13151225 is an equidigital number, since it uses as much as digits as its factorization.

13151225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 526059 (or 526054 counting only the distinct ones).

The product of its digits is 300, while the sum is 20.

The square root of 13151225 is about 3626.4617742367. The cubic root of 13151225 is about 236.0417011917.

Adding to 13151225 its reverse (52215131), we get a palindrome (65366356).

The spelling of 13151225 in words is "thirteen million, one hundred fifty-one thousand, two hundred twenty-five".