243201312503 has 4 divisors (see below), whose sum is σ = 257507272080. Its totient is φ = 228895352928.

The previous prime is 243201312493. The next prime is 243201312547. The reversal of 243201312503 is 305213102342.

It is a happy number.

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 243201312503 - 2⁶ = 243201312439 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 (243201312593) 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, 7152979763 + ... + 7152979796.

It is an arithmetic number, because the mean of its divisors is an integer number (64376818020).

Almost surely, 2^243201312503 is an apocalyptic number.

243201312503 is a deficient number, since it is larger than the sum of its proper divisors (14305959577).

243201312503 is a wasteful number, since it uses less digits than its factorization.

243201312503 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14305959576.

The product of its (nonzero) digits is 4320, while the sum is 26.

Adding to 243201312503 its reverse (305213102342), we get a palindrome (548414414845).

The spelling of 243201312503 in words is "two hundred forty-three billion, two hundred one million, three hundred twelve thousand, five hundred three".