243244968917 has 2 divisors, whose sum is σ = 243244968918. Its totient is φ = 243244968916.

The previous prime is 243244968859. The next prime is 243244968947. The reversal of 243244968917 is 719869442342.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 175922363761 + 67322605156 = 419431^2 + 259466^2 .

It is a cyclic number.

It is not a de Polignac number, because 243244968917 - 2¹⁰ = 243244967893 is a prime.

It is a super-2 number, since 2×243244968917² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (243244968947) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121622484458 + 121622484459.

It is an arithmetic number, because the mean of its divisors is an integer number (121622484459).

Almost surely, 2^243244968917 is an apocalyptic number.

It is an amenable number.

243244968917 is a deficient number, since it is larger than the sum of its proper divisors (1).

243244968917 is an equidigital number, since it uses as much as digits as its factorization.

243244968917 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20901888, while the sum is 59.

The spelling of 243244968917 in words is "two hundred forty-three billion, two hundred forty-four million, nine hundred sixty-eight thousand, nine hundred seventeen".