581243 has 4 divisors (see below), whose sum is σ = 625968. Its totient is φ = 536520.

The previous prime is 581239. The next prime is 581261. The reversal of 581243 is 342185.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 342185 = 5 ⋅68437.

It is a cyclic number.

It is not a de Polignac number, because 581243 - 2² = 581239 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (581263) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22343 + ... + 22368.

It is an arithmetic number, because the mean of its divisors is an integer number (156492).

2⁵⁸¹²⁴³ is an apocalyptic number.

581243 is a deficient number, since it is larger than the sum of its proper divisors (44725).

581243 is a wasteful number, since it uses less digits than its factorization.

581243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44724.

The product of its digits is 960, while the sum is 23.

The square root of 581243 is about 762.3929433042. The cubic root of 581243 is about 83.4550417139.

The spelling of 581243 in words is "five hundred eighty-one thousand, two hundred forty-three".