243045503 has 6 divisors (see below), whose sum is σ = 248831064. Its totient is φ = 237391476.

The previous prime is 243045493. The next prime is 243045521. The reversal of 243045503 is 305540342.

It is not a de Polignac number, because 243045503 - 2²⁰ = 241996927 is a prime.

It is a super-2 number, since 2×243045503² = 118142233057046018, 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 (243045403) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 63875 + ... + 67572.

It is an arithmetic number, because the mean of its divisors is an integer number (41471844).

Almost surely, 2^243045503 is an apocalyptic number.

243045503 is a deficient number, since it is larger than the sum of its proper divisors (5785561).

243045503 is an equidigital number, since it uses as much as digits as its factorization.

243045503 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 131533 (or 131490 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 26.

The square root of 243045503 is about 15589.9167092066. The cubic root of 243045503 is about 624.0640951242.

Adding to 243045503 its reverse (305540342), we get a palindrome (548585845).

The spelling of 243045503 in words is "two hundred forty-three million, forty-five thousand, five hundred three".