243444111213 has 4 divisors (see below), whose sum is σ = 324592148288. Its totient is φ = 162296074140.

The previous prime is 243444111149. The next prime is 243444111233. The reversal of 243444111213 is 312111444342.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 243444111213 - 2⁶ = 243444111149 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 (243444111233) 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, 40574018533 + ... + 40574018538.

It is an arithmetic number, because the mean of its divisors is an integer number (81148037072).

Almost surely, 2^243444111213 is an apocalyptic number.

It is an amenable number.

243444111213 is a deficient number, since it is larger than the sum of its proper divisors (81148037075).

243444111213 is an equidigital number, since it uses as much as digits as its factorization.

243444111213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81148037074.

The product of its digits is 9216, while the sum is 30.

Adding to 243444111213 its reverse (312111444342), we get a palindrome (555555555555).

The spelling of 243444111213 in words is "two hundred forty-three billion, four hundred forty-four million, one hundred eleven thousand, two hundred thirteen".