53581 has 4 divisors (see below), whose sum is σ = 58464. Its totient is φ = 48700.

The previous prime is 53569. The next prime is 53591. The reversal of 53581 is 18535.

53581 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is the 95-th star number.

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 53581 - 2⁵ = 53549 is a prime.

It is a super-2 number, since 2×53581² = 5741847122, which contains 22 as substring.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

53581 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (53551) 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, 2425 + ... + 2446.

It is an arithmetic number, because the mean of its divisors is an integer number (14616).

2⁵³⁵⁸¹ is an apocalyptic number.

It is an amenable number.

53581 is a deficient number, since it is larger than the sum of its proper divisors (4883).

53581 is a wasteful number, since it uses less digits than its factorization.

53581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4882.

The product of its digits is 600, while the sum is 22.

The square root of 53581 is about 231.4757006686. The cubic root of 53581 is about 37.6996170107.

It can be divided in two parts, 535 and 81, that added together give a palindrome (616).

The spelling of 53581 in words is "fifty-three thousand, five hundred eighty-one".