13815265 has 4 divisors (see below), whose sum is σ = 16578324. Its totient is φ = 11052208.

The previous prime is 13815257. The next prime is 13815289. The reversal of 13815265 is 56251831.

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 3651921 + 10163344 = 1911^2 + 3188^2 .

It is a cyclic number.

It is not a de Polignac number, because 13815265 - 2³ = 13815257 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 an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 1381522 + ... + 1381531.

It is an arithmetic number, because the mean of its divisors is an integer number (4144581).

Almost surely, 2^13815265 is an apocalyptic number.

It is an amenable number.

13815265 is a deficient number, since it is larger than the sum of its proper divisors (2763059).

13815265 is an equidigital number, since it uses as much as digits as its factorization.

13815265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2763058.

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

The square root of 13815265 is about 3716.8891562703. The cubic root of 13815265 is about 239.9494395807.

The spelling of 13815265 in words is "thirteen million, eight hundred fifteen thousand, two hundred sixty-five".