13581265 has 4 divisors (see below), whose sum is σ = 16297524. Its totient is φ = 10865008.

The previous prime is 13581229. The next prime is 13581287. The reversal of 13581265 is 56218531.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5234944 + 8346321 = 2288^2 + 2889^2 .

It is a cyclic number.

It is not a de Polignac number, because 13581265 - 2⁷ = 13581137 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a zygodrome in base 3.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1358122 + ... + 1358131.

It is an arithmetic number, because the mean of its divisors is an integer number (4074381).

Almost surely, 2^13581265 is an apocalyptic number.

It is an amenable number.

13581265 is a deficient number, since it is larger than the sum of its proper divisors (2716259).

13581265 is an equidigital number, since it uses as much as digits as its factorization.

13581265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2716258.

The product of its digits is 7200, while the sum is 31.

The square root of 13581265 is about 3685.2767874340. The cubic root of 13581265 is about 238.5869806260.

Adding to 13581265 its reverse (56218531), we get a palindrome (69799796).

The spelling of 13581265 in words is "thirteen million, five hundred eighty-one thousand, two hundred sixty-five".