243251441 has 2 divisors, whose sum is σ = 243251442. Its totient is φ = 243251440.

The previous prime is 243251429. The next prime is 243251479. The reversal of 243251441 is 144152342.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 183033841 + 60217600 = 13529^2 + 7760^2 .

It is a cyclic number.

It is not a de Polignac number, because 243251441 - 2⁶ = 243251377 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 243251441.

It is not a weakly prime, because it can be changed into another prime (243253441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121625720 + 121625721.

It is an arithmetic number, because the mean of its divisors is an integer number (121625721).

Almost surely, 2^243251441 is an apocalyptic number.

It is an amenable number.

243251441 is a deficient number, since it is larger than the sum of its proper divisors (1).

243251441 is an equidigital number, since it uses as much as digits as its factorization.

243251441 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3840, while the sum is 26.

The square root of 243251441 is about 15596.5201567529. The cubic root of 243251441 is about 624.2403066130.

Subtracting from 243251441 its reverse (144152342), we obtain a palindrome (99099099).

The spelling of 243251441 in words is "two hundred forty-three million, two hundred fifty-one thousand, four hundred forty-one".