217734089 has 2 divisors, whose sum is σ = 217734090. Its totient is φ = 217734088.

The previous prime is 217734047. The next prime is 217734103. The reversal of 217734089 is 980437712.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 217267600 + 466489 = 14740^2 + 683^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-217734089 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (217734029) 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, 108867044 + 108867045.

It is an arithmetic number, because the mean of its divisors is an integer number (108867045).

Almost surely, 2^217734089 is an apocalyptic number.

It is an amenable number.

217734089 is a deficient number, since it is larger than the sum of its proper divisors (1).

217734089 is an equidigital number, since it uses as much as digits as its factorization.

217734089 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 84672, while the sum is 41.

The square root of 217734089 is about 14755.8154298568. The cubic root of 217734089 is about 601.6013602363.

The spelling of 217734089 in words is "two hundred seventeen million, seven hundred thirty-four thousand, eighty-nine".