243111133213 has 4 divisors (see below), whose sum is σ = 261811989628. Its totient is φ = 224410276800.

The previous prime is 243111133207. The next prime is 243111133261. The reversal of 243111133213 is 312331111342.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 12693852889 + 230417280324 = 112667^2 + 480018^2 .

It is a cyclic number.

It is not a de Polignac number, because 243111133213 - 2⁹ = 243111132701 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 (243111133273) 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, 9350428188 + ... + 9350428213.

It is an arithmetic number, because the mean of its divisors is an integer number (65452997407).

Almost surely, 2^243111133213 is an apocalyptic number.

It is an amenable number.

243111133213 is a deficient number, since it is larger than the sum of its proper divisors (18700856415).

243111133213 is a wasteful number, since it uses less digits than its factorization.

243111133213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18700856414.

The product of its digits is 1296, while the sum is 25.

Adding to 243111133213 its reverse (312331111342), we get a palindrome (555442244555).

The spelling of 243111133213 in words is "two hundred forty-three billion, one hundred eleven million, one hundred thirty-three thousand, two hundred thirteen".