13265561 has 2 divisors, whose sum is σ = 13265562. Its totient is φ = 13265560.

The previous prime is 13265533. The next prime is 13265563. The reversal of 13265561 is 16556231.

13265561 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7529536 + 5736025 = 2744^2 + 2395^2 .

It is an emirp because it is prime and its reverse (16556231) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13265561 is a prime.

Together with 13265563, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (13265563) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6632780 + 6632781.

It is an arithmetic number, because the mean of its divisors is an integer number (6632781).

Almost surely, 2^13265561 is an apocalyptic number.

It is an amenable number.

13265561 is a deficient number, since it is larger than the sum of its proper divisors (1).

13265561 is an equidigital number, since it uses as much as digits as its factorization.

13265561 is an evil number, because the sum of its binary digits is even.

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

The square root of 13265561 is about 3642.1917851755. The cubic root of 13265561 is about 236.7237727258.

The spelling of 13265561 in words is "thirteen million, two hundred sixty-five thousand, five hundred sixty-one".