13008581 has 4 divisors (see below), whose sum is σ = 13019712. Its totient is φ = 12997452.

The previous prime is 13008563. The next prime is 13008599. The reversal of 13008581 is 18580031.

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 a brilliant number, because the two primes have the same length.

It is an interprime number because it is at equal distance from previous prime (13008563) and next prime (13008599).

It is a cyclic number.

It is not a de Polignac number, because 13008581 - 2⁶ = 13008517 is a prime.

It is a super-2 number, since 2×13008581² = 338446359267122, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 13008581.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13008181) 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, 3575 + ... + 6228.

It is an arithmetic number, because the mean of its divisors is an integer number (3254928).

Almost surely, 2^13008581 is an apocalyptic number.

It is an amenable number.

13008581 is a deficient number, since it is larger than the sum of its proper divisors (11131).

13008581 is an equidigital number, since it uses as much as digits as its factorization.

13008581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11130.

The product of its (nonzero) digits is 960, while the sum is 26.

The square root of 13008581 is about 3606.7410497567. The cubic root of 13008581 is about 235.1851927853.

The spelling of 13008581 in words is "thirteen million, eight thousand, five hundred eighty-one".