243121113017 has 2 divisors, whose sum is σ = 243121113018. Its totient is φ = 243121113016.

The previous prime is 243121112999. The next prime is 243121113047. The reversal of 243121113017 is 710311121342.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 228731671081 + 14389441936 = 478259^2 + 119956^2 .

It is a cyclic number.

It is not a de Polignac number, because 243121113017 - 2¹⁸ = 243120850873 is a prime.

It is not a weakly prime, because it can be changed into another prime (243121113047) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121560556508 + 121560556509.

It is an arithmetic number, because the mean of its divisors is an integer number (121560556509).

Almost surely, 2^243121113017 is an apocalyptic number.

It is an amenable number.

243121113017 is a deficient number, since it is larger than the sum of its proper divisors (1).

243121113017 is an equidigital number, since it uses as much as digits as its factorization.

243121113017 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1008, while the sum is 26.

Adding to 243121113017 its reverse (710311121342), we get a palindrome (953432234359).

The spelling of 243121113017 in words is "two hundred forty-three billion, one hundred twenty-one million, one hundred thirteen thousand, seventeen".