243440244401 has 2 divisors, whose sum is σ = 243440244402. Its totient is φ = 243440244400.

The previous prime is 243440244391. The next prime is 243440244403. The reversal of 243440244401 is 104442044342.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 222043576225 + 21396668176 = 471215^2 + 146276^2 .

It is a cyclic number.

It is not a de Polignac number, because 243440244401 - 2³⁰ = 242366502577 is a prime.

It is a super-2 number, since 2×243440244401² (a number of 24 digits) contains 22 as substring.

It is a Sophie Germain prime.

Together with 243440244403, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (243440244403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121720122200 + 121720122201.

It is an arithmetic number, because the mean of its divisors is an integer number (121720122201).

Almost surely, 2^243440244401 is an apocalyptic number.

It is an amenable number.

243440244401 is a deficient number, since it is larger than the sum of its proper divisors (1).

243440244401 is an equidigital number, since it uses as much as digits as its factorization.

243440244401 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 49152, while the sum is 32.

Adding to 243440244401 its reverse (104442044342), we get a palindrome (347882288743).

The spelling of 243440244401 in words is "two hundred forty-three billion, four hundred forty million, two hundred forty-four thousand, four hundred one".