13268581 has 4 divisors (see below), whose sum is σ = 13345452. Its totient is φ = 13191712.

The previous prime is 13268561. The next prime is 13268609. The reversal of 13268581 is 18586231.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 18586231 = 23 ⋅808097.

It can be written as a sum of positive squares in 2 ways, for example, as 8468100 + 4800481 = 2910^2 + 2191^2 .

It is a cyclic number.

It is not a de Polignac number, because 13268581 - 2¹³ = 13260389 is a prime.

It is a super-2 number, since 2×13268581² = 352110483507122, which contains 22 as substring.

It is a Duffinian number.

It is a nialpdrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13268531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 38176 + ... + 38521.

It is an arithmetic number, because the mean of its divisors is an integer number (3336363).

Almost surely, 2^13268581 is an apocalyptic number.

It is an amenable number.

13268581 is a deficient number, since it is larger than the sum of its proper divisors (76871).

13268581 is an equidigital number, since it uses as much as digits as its factorization.

13268581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76870.

The product of its digits is 11520, while the sum is 34.

The square root of 13268581 is about 3642.6063471092. The cubic root of 13268581 is about 236.7417353170.

The spelling of 13268581 in words is "thirteen million, two hundred sixty-eight thousand, five hundred eighty-one".