243103 has 4 divisors (see below), whose sum is σ = 277840. Its totient is φ = 208368.

The previous prime is 243101. The next prime is 243109. The reversal of 243103 is 301342.

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 243103 - 2¹ = 243101 is a prime.

It is a Duffinian number.

243103 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243101) 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, 17358 + ... + 17371.

It is an arithmetic number, because the mean of its divisors is an integer number (69460).

2²⁴³¹⁰³ is an apocalyptic number.

243103 is a deficient number, since it is larger than the sum of its proper divisors (34737).

243103 is an equidigital number, since it uses as much as digits as its factorization.

243103 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34736.

The product of its (nonzero) digits is 72, while the sum is 13.

The square root of 243103 is about 493.0547636926. The cubic root of 243103 is about 62.4113302623.

Adding to 243103 its reverse (301342), we get a palindrome (544445).

The spelling of 243103 in words is "two hundred forty-three thousand, one hundred three", and thus it is an iban number.