203543 has 4 divisors (see below), whose sum is σ = 205920. Its totient is φ = 201168.

The previous prime is 203531. The next prime is 203549. The reversal of 203543 is 345302.

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 203543 - 2¹⁰ = 202519 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 (203549) 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, 1055 + ... + 1232.

It is an arithmetic number, because the mean of its divisors is an integer number (51480).

2²⁰³⁵⁴³ is an apocalyptic number.

203543 is a deficient number, since it is larger than the sum of its proper divisors (2377).

203543 is an equidigital number, since it uses as much as digits as its factorization.

203543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2376.

The product of its (nonzero) digits is 360, while the sum is 17.

The square root of 203543 is about 451.1574004713. The cubic root of 203543 is about 58.8236619409.

Adding to 203543 its reverse (345302), we get a palindrome (548845).

The spelling of 203543 in words is "two hundred three thousand, five hundred forty-three".