243121111447 has 2 divisors, whose sum is σ = 243121111448. Its totient is φ = 243121111446.

The previous prime is 243121111391. The next prime is 243121111477. The reversal of 243121111447 is 744111121342.

243121111447 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-243121111447 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (243121111477) 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, 121560555723 + 121560555724.

It is an arithmetic number, because the mean of its divisors is an integer number (121560555724).

Almost surely, 2^243121111447 is an apocalyptic number.

243121111447 is a deficient number, since it is larger than the sum of its proper divisors (1).

243121111447 is an equidigital number, since it uses as much as digits as its factorization.

243121111447 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5376, while the sum is 31.

Adding to 243121111447 its reverse (744111121342), we get a palindrome (987232232789).

The spelling of 243121111447 in words is "two hundred forty-three billion, one hundred twenty-one million, one hundred eleven thousand, four hundred forty-seven".