243121241617 has 2 divisors, whose sum is σ = 243121241618. Its totient is φ = 243121241616.

The previous prime is 243121241507. The next prime is 243121241647. The reversal of 243121241617 is 716142121342.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 221275219201 + 21846022416 = 470399^2 + 147804^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-243121241617 is a prime.

It is not a weakly prime, because it can be changed into another prime (243121241647) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121560620808 + 121560620809.

It is an arithmetic number, because the mean of its divisors is an integer number (121560620809).

Almost surely, 2^243121241617 is an apocalyptic number.

It is an amenable number.

243121241617 is a deficient number, since it is larger than the sum of its proper divisors (1).

243121241617 is an equidigital number, since it uses as much as digits as its factorization.

243121241617 is an evil number, because the sum of its binary digits is even.

The product of its digits is 16128, while the sum is 34.

Adding to 243121241617 its reverse (716142121342), we get a palindrome (959263362959).

The spelling of 243121241617 in words is "two hundred forty-three billion, one hundred twenty-one million, two hundred forty-one thousand, six hundred seventeen".