13565261 has 4 divisors (see below), whose sum is σ = 13605852. Its totient is φ = 13524672.

The previous prime is 13565213. The next prime is 13565263. The reversal of 13565261 is 16256531.

13565261 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 16256531 = 53 ⋅306727.

It can be written as a sum of positive squares in 2 ways, for example, as 7896100 + 5669161 = 2810^2 + 2381^2 .

It is a cyclic number.

It is not a de Polignac number, because 13565261 - 2¹⁸ = 13303117 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13565263) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19790 + ... + 20463.

It is an arithmetic number, because the mean of its divisors is an integer number (3401463).

Almost surely, 2^13565261 is an apocalyptic number.

It is an amenable number.

13565261 is a deficient number, since it is larger than the sum of its proper divisors (40591).

13565261 is an equidigital number, since it uses as much as digits as its factorization.

13565261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40590.

The product of its digits is 5400, while the sum is 29.

The square root of 13565261 is about 3683.1048043736. The cubic root of 13565261 is about 238.4932277772.

The spelling of 13565261 in words is "thirteen million, five hundred sixty-five thousand, two hundred sixty-one".