243504323417 has 2 divisors, whose sum is σ = 243504323418. Its totient is φ = 243504323416.

The previous prime is 243504323351. The next prime is 243504323423. The reversal of 243504323417 is 714323405342.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 149203740361 + 94300583056 = 386269^2 + 307084^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-243504323417 is a prime.

It is not a weakly prime, because it can be changed into another prime (243504323467) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121752161708 + 121752161709.

It is an arithmetic number, because the mean of its divisors is an integer number (121752161709).

Almost surely, 2^243504323417 is an apocalyptic number.

It is an amenable number.

243504323417 is a deficient number, since it is larger than the sum of its proper divisors (1).

243504323417 is an equidigital number, since it uses as much as digits as its factorization.

243504323417 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 241920, while the sum is 38.

Adding to 243504323417 its reverse (714323405342), we get a palindrome (957827728759).

The spelling of 243504323417 in words is "two hundred forty-three billion, five hundred four million, three hundred twenty-three thousand, four hundred seventeen".