243243503 has 4 divisors (see below), whose sum is σ = 251631240. Its totient is φ = 234855768.

The previous prime is 243243499. The next prime is 243243509. The reversal of 243243503 is 305342342.

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 243243503 - 2² = 243243499 is a prime.

It is a super-2 number, since 2×243243503² = 118334803503422018, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243243509) 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, 4193825 + ... + 4193882.

It is an arithmetic number, because the mean of its divisors is an integer number (62907810).

Almost surely, 2^243243503 is an apocalyptic number.

243243503 is a deficient number, since it is larger than the sum of its proper divisors (8387737).

243243503 is an equidigital number, since it uses as much as digits as its factorization.

243243503 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8387736.

The product of its (nonzero) digits is 8640, while the sum is 26.

The square root of 243243503 is about 15596.2656748338. The cubic root of 243243503 is about 624.2335162819.

Adding to 243243503 its reverse (305342342), we get a palindrome (548585845).

The spelling of 243243503 in words is "two hundred forty-three million, two hundred forty-three thousand, five hundred three".