243117617 has 2 divisors, whose sum is σ = 243117618. Its totient is φ = 243117616.

The previous prime is 243117601. The next prime is 243117619. The reversal of 243117617 is 716711342.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 199346161 + 43771456 = 14119^2 + 6616^2 .

It is a cyclic number.

It is not a de Polignac number, because 243117617 - 2⁴ = 243117601 is a prime.

Together with 243117619, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (243117619) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121558808 + 121558809.

It is an arithmetic number, because the mean of its divisors is an integer number (121558809).

Almost surely, 2^243117617 is an apocalyptic number.

It is an amenable number.

243117617 is a deficient number, since it is larger than the sum of its proper divisors (1).

243117617 is an equidigital number, since it uses as much as digits as its factorization.

243117617 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7056, while the sum is 32.

The square root of 243117617 is about 15592.2293787643. The cubic root of 243117617 is about 624.1258110132.

Adding to 243117617 its reverse (716711342), we get a palindrome (959828959).

The spelling of 243117617 in words is "two hundred forty-three million, one hundred seventeen thousand, six hundred seventeen".