243121244417 has 2 divisors, whose sum is σ = 243121244418. Its totient is φ = 243121244416.

The previous prime is 243121244413. The next prime is 243121244557. The reversal of 243121244417 is 714442121342.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 235384106896 + 7737137521 = 485164^2 + 87961^2 .

It is a cyclic number.

It is not a de Polignac number, because 243121244417 - 2² = 243121244413 is a prime.

It is not a weakly prime, because it can be changed into another prime (243121244413) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121560622208 + 121560622209.

It is an arithmetic number, because the mean of its divisors is an integer number (121560622209).

Almost surely, 2^243121244417 is an apocalyptic number.

It is an amenable number.

243121244417 is a deficient number, since it is larger than the sum of its proper divisors (1).

243121244417 is an equidigital number, since it uses as much as digits as its factorization.

243121244417 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 43008, while the sum is 35.

Adding to 243121244417 its reverse (714442121342), we get a palindrome (957563365759).

The spelling of 243121244417 in words is "two hundred forty-three billion, one hundred twenty-one million, two hundred forty-four thousand, four hundred seventeen".