243531312243 has 4 divisors (see below), whose sum is σ = 324708416328. Its totient is φ = 162354208160.

The previous prime is 243531312179. The next prime is 243531312247. The reversal of 243531312243 is 342213135342.

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 243531312243 - 2⁶ = 243531312179 is a prime.

It is not an unprimeable number, because it can be changed into a prime (243531312247) 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, 40588552038 + ... + 40588552043.

It is an arithmetic number, because the mean of its divisors is an integer number (81177104082).

Almost surely, 2^243531312243 is an apocalyptic number.

243531312243 is a deficient number, since it is larger than the sum of its proper divisors (81177104085).

243531312243 is an equidigital number, since it uses as much as digits as its factorization.

243531312243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81177104084.

The product of its digits is 51840, while the sum is 33.

Adding to 243531312243 its reverse (342213135342), we get a palindrome (585744447585).

The spelling of 243531312243 in words is "two hundred forty-three billion, five hundred thirty-one million, three hundred twelve thousand, two hundred forty-three".