243440111 has 2 divisors, whose sum is σ = 243440112. Its totient is φ = 243440110.

The previous prime is 243440107. The next prime is 243440137. The reversal of 243440111 is 111044342.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 243440111 - 2² = 243440107 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (243440101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121720055 + 121720056.

It is an arithmetic number, because the mean of its divisors is an integer number (121720056).

Almost surely, 2^243440111 is an apocalyptic number.

243440111 is a deficient number, since it is larger than the sum of its proper divisors (1).

243440111 is an equidigital number, since it uses as much as digits as its factorization.

243440111 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 384, while the sum is 20.

The square root of 243440111 is about 15602.5674489810. The cubic root of 243440111 is about 624.4016554101.

Adding to 243440111 its reverse (111044342), we get a palindrome (354484453).

The spelling of 243440111 in words is "two hundred forty-three million, four hundred forty thousand, one hundred eleven".