243919441 has 2 divisors, whose sum is σ = 243919442. Its totient is φ = 243919440.

The previous prime is 243919411. The next prime is 243919517. The reversal of 243919441 is 144919342.

243919441 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 239630400 + 4289041 = 15480^2 + 2071^2 .

It is a cyclic number.

It is not a de Polignac number, because 243919441 - 2¹³ = 243911249 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 243919441.

It is not a weakly prime, because it can be changed into another prime (243919411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121959720 + 121959721.

It is an arithmetic number, because the mean of its divisors is an integer number (121959721).

Almost surely, 2^243919441 is an apocalyptic number.

It is an amenable number.

243919441 is a deficient number, since it is larger than the sum of its proper divisors (1).

243919441 is an equidigital number, since it uses as much as digits as its factorization.

243919441 is an evil number, because the sum of its binary digits is even.

The product of its digits is 31104, while the sum is 37.

The square root of 243919441 is about 15617.9205081855. The cubic root of 243919441 is about 624.8111992926.

Subtracting from 243919441 its reverse (144919342), we obtain a palindrome (99000099).

The spelling of 243919441 in words is "two hundred forty-three million, nine hundred nineteen thousand, four hundred forty-one".