41581 has 4 divisors (see below), whose sum is σ = 42592. Its totient is φ = 40572.

The previous prime is 41579. The next prime is 41593. The reversal of 41581 is 18514.

41581 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, and also an emirpimes, since its reverse is a distinct semiprime: 18514 = 2 ⋅9257.

It is a cyclic number.

It is not a de Polignac number, because 41581 - 2¹ = 41579 is a prime.

It is a super-2 number, since 2×41581² = 3457959122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (41521) 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, 441 + ... + 526.

It is an arithmetic number, because the mean of its divisors is an integer number (10648).

2⁴¹⁵⁸¹ is an apocalyptic number.

It is an amenable number.

41581 is a deficient number, since it is larger than the sum of its proper divisors (1011).

41581 is an equidigital number, since it uses as much as digits as its factorization.

41581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1010.

The product of its digits is 160, while the sum is 19.

The square root of 41581 is about 203.9141976420. The cubic root of 41581 is about 34.6442882363.

It can be divided in two parts, 415 and 81, that added together give a triangular number (496 = T₃₁).

The spelling of 41581 in words is "forty-one thousand, five hundred eighty-one".