581501 has 4 divisors (see below), whose sum is σ = 585504. Its totient is φ = 577500.

The previous prime is 581491. The next prime is 581521. The reversal of 581501 is 105185.

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 581501 - 2¹⁰ = 580477 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (581521) 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, 1775 + ... + 2076.

It is an arithmetic number, because the mean of its divisors is an integer number (146376).

2⁵⁸¹⁵⁰¹ is an apocalyptic number.

It is an amenable number.

581501 is a deficient number, since it is larger than the sum of its proper divisors (4003).

581501 is a wasteful number, since it uses less digits than its factorization.

581501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4002.

The product of its (nonzero) digits is 200, while the sum is 20.

The square root of 581501 is about 762.5621286164. The cubic root of 581501 is about 83.4673877927.

Adding to 581501 its reverse (105185), we get a palindrome (686686).

The spelling of 581501 in words is "five hundred eighty-one thousand, five hundred one".