13565081 has 4 divisors (see below), whose sum is σ = 13880592. Its totient is φ = 13249572.

The previous prime is 13565059. The next prime is 13565089. The reversal of 13565081 is 18056531.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 18056531 = 29 ⋅622639.

It is a cyclic number.

It is not a de Polignac number, because 13565081 - 2⁶ = 13565017 is a prime.

It is a super-2 number, since 2×13565081² = 368022845073122, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (13565089) 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, 157691 + ... + 157776.

It is an arithmetic number, because the mean of its divisors is an integer number (3470148).

Almost surely, 2^13565081 is an apocalyptic number.

It is an amenable number.

13565081 is a deficient number, since it is larger than the sum of its proper divisors (315511).

13565081 is an equidigital number, since it uses as much as digits as its factorization.

13565081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 315510.

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

The square root of 13565081 is about 3683.0803683873. The cubic root of 13565081 is about 238.4921729020.

The spelling of 13565081 in words is "thirteen million, five hundred sixty-five thousand, eighty-one".