13081565 has 16 divisors (see below), whose sum is σ = 18058368. Its totient is φ = 8911296.

The previous prime is 13081559. The next prime is 13081573. The reversal of 13081565 is 56518031.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13081565 is a prime.

It is a super-2 number, since 2×13081565² = 342254685698450, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4559 + ... + 6851.

It is an arithmetic number, because the mean of its divisors is an integer number (1128648).

Almost surely, 2^13081565 is an apocalyptic number.

It is an amenable number.

13081565 is a deficient number, since it is larger than the sum of its proper divisors (4976803).

13081565 is a wasteful number, since it uses less digits than its factorization.

13081565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2468.

The product of its (nonzero) digits is 3600, while the sum is 29.

The square root of 13081565 is about 3616.8446192780. The cubic root of 13081565 is about 235.6242044172.

Adding to 13081565 its reverse (56518031), we get a palindrome (69599596).

The spelling of 13081565 in words is "thirteen million, eighty-one thousand, five hundred sixty-five".