217118113 has 2 divisors, whose sum is σ = 217118114. Its totient is φ = 217118112.

The previous prime is 217118089. The next prime is 217118117. The reversal of 217118113 is 311811712.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 206698129 + 10419984 = 14377^2 + 3228^2 .

It is a cyclic number.

It is not a de Polignac number, because 217118113 - 2⁹ = 217117601 is a prime.

It is not a weakly prime, because it can be changed into another prime (217118117) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108559056 + 108559057.

It is an arithmetic number, because the mean of its divisors is an integer number (108559057).

Almost surely, 2^217118113 is an apocalyptic number.

It is an amenable number.

217118113 is a deficient number, since it is larger than the sum of its proper divisors (1).

217118113 is an equidigital number, since it uses as much as digits as its factorization.

217118113 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 336, while the sum is 25.

The square root of 217118113 is about 14734.9283337246. The cubic root of 217118113 is about 601.0335085594.

Adding to 217118113 its reverse (311811712), we get a palindrome (528929825).

The spelling of 217118113 in words is "two hundred seventeen million, one hundred eighteen thousand, one hundred thirteen".