13243565 has 4 divisors (see below), whose sum is σ = 15892284. Its totient is φ = 10594848.

The previous prime is 13243547. The next prime is 13243579. The reversal of 13243565 is 56534231.

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 2758921 + 10484644 = 1661^2 + 3238^2 .

It is a cyclic number.

It is not a de Polignac number, because 13243565 - 2¹² = 13239469 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1324352 + ... + 1324361.

It is an arithmetic number, because the mean of its divisors is an integer number (3973071).

Almost surely, 2^13243565 is an apocalyptic number.

It is an amenable number.

13243565 is a deficient number, since it is larger than the sum of its proper divisors (2648719).

13243565 is an equidigital number, since it uses as much as digits as its factorization.

13243565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2648718.

The product of its digits is 10800, while the sum is 29.

The square root of 13243565 is about 3639.1709220645. The cubic root of 13243565 is about 236.5928608932.

Adding to 13243565 its reverse (56534231), we get a palindrome (69777796).

The spelling of 13243565 in words is "thirteen million, two hundred forty-three thousand, five hundred sixty-five".