243440431042331 has 4 divisors (see below), whose sum is σ = 243973123452072. Its totient is φ = 242907738632592.

The previous prime is 243440431042313. The next prime is 243440431042337. The reversal of 243440431042331 is 133240134044342.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-243440431042331 is a prime.

It is a super-2 number, since 2×243440431042331² (a number of 30 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (243440431042337) 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, 266346204185 + ... + 266346205098.

It is an arithmetic number, because the mean of its divisors is an integer number (60993280863018).

Almost surely, 2^{243440431042331} is an apocalyptic number.

243440431042331 is a deficient number, since it is larger than the sum of its proper divisors (532692409741).

243440431042331 is an equidigital number, since it uses as much as digits as its factorization.

243440431042331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 532692409740.

The product of its (nonzero) digits is 331776, while the sum is 38.

Adding to 243440431042331 its reverse (133240134044342), we get a palindrome (376680565086673).

The spelling of 243440431042331 in words is "two hundred forty-three trillion, four hundred forty billion, four hundred thirty-one million, forty-two thousand, three hundred thirty-one".