243155314417 has 2 divisors, whose sum is σ = 243155314418. Its totient is φ = 243155314416.

The previous prime is 243155314397. The next prime is 243155314433. The reversal of 243155314417 is 714413551342.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 167529764416 + 75625550001 = 409304^2 + 275001^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-243155314417 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 243155314417.

It is not a weakly prime, because it can be changed into another prime (243155312417) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121577657208 + 121577657209.

It is an arithmetic number, because the mean of its divisors is an integer number (121577657209).

Almost surely, 2^243155314417 is an apocalyptic number.

It is an amenable number.

243155314417 is a deficient number, since it is larger than the sum of its proper divisors (1).

243155314417 is an equidigital number, since it uses as much as digits as its factorization.

243155314417 is an evil number, because the sum of its binary digits is even.

The product of its digits is 201600, while the sum is 40.

Adding to 243155314417 its reverse (714413551342), we get a palindrome (957568865759).

The spelling of 243155314417 in words is "two hundred forty-three billion, one hundred fifty-five million, three hundred fourteen thousand, four hundred seventeen".