506543 has 4 divisors (see below), whose sum is σ = 524040. Its totient is φ = 489048.

The previous prime is 506537. The next prime is 506551. The reversal of 506543 is 345605.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 506543 - 2⁶ = 506479 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 (506533) 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, 8705 + ... + 8762.

It is an arithmetic number, because the mean of its divisors is an integer number (131010).

2⁵⁰⁶⁵⁴³ is an apocalyptic number.

506543 is a deficient number, since it is larger than the sum of its proper divisors (17497).

506543 is a wasteful number, since it uses less digits than its factorization.

506543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17496.

The product of its (nonzero) digits is 1800, while the sum is 23.

The square root of 506543 is about 711.7183431667. The cubic root of 506543 is about 79.7147654745.

The spelling of 506543 in words is "five hundred six thousand, five hundred forty-three".