10581 has 4 divisors (see below), whose sum is σ = 14112. Its totient is φ = 7052.
The previous prime is 10567. The next prime is 10589. The reversal of 10581 is 18501.
It is a happy number.
10581 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.
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.
It is a cyclic number.
It is not a de Polignac number, because 10581 - 27 = 10453 is a prime.
It is a super-2 number, since 2×105812 = 223915122, which contains 22 as substring.
It is a D-number.
It is an alternating number because its digits alternate between odd and even.
It is a Curzon number.
It is a nialpdrome in base 4.
It is a zygodrome in base 4.
It is a self number, because there is not a number n which added to its sum of digits gives 10581.
It is a congruent number.
It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 10581.
It is not an unprimeable number, because it can be changed into a prime (10589) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (7) of ones.
It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1761 + ... + 1766.
It is an arithmetic number, because the mean of its divisors is an integer number (3528).
210581 is an apocalyptic number.
It is an amenable number.
10581 is a deficient number, since it is larger than the sum of its proper divisors (3531).
10581 is an equidigital number, since it uses as much as digits as its factorization.
10581 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 3530.
The product of its (nonzero) digits is 40, while the sum is 15.
The square root of 10581 is about 102.8639878675. The cubic root of 10581 is about 21.9537596278.
The spelling of 10581 in words is "ten thousand, five hundred eighty-one".
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