581543 has 4 divisors (see below), whose sum is σ = 583080. Its totient is φ = 580008.

The previous prime is 581527. The next prime is 581549. The reversal of 581543 is 345185.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 581543 - 2⁴ = 581527 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (581549) 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, 248 + ... + 1106.

It is an arithmetic number, because the mean of its divisors is an integer number (145770).

2⁵⁸¹⁵⁴³ is an apocalyptic number.

581543 is a deficient number, since it is larger than the sum of its proper divisors (1537).

581543 is an equidigital number, since it uses as much as digits as its factorization.

581543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1536.

The product of its digits is 2400, while the sum is 26.

The square root of 581543 is about 762.5896668589. The cubic root of 581543 is about 83.4693972739.

The spelling of 581543 in words is "five hundred eighty-one thousand, five hundred forty-three".