217047293 has 2 divisors, whose sum is σ = 217047294. Its totient is φ = 217047292.

The previous prime is 217047277. The next prime is 217047301. The reversal of 217047293 is 392740712.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 112741924 + 104305369 = 10618^2 + 10213^2 .

It is a cyclic number.

It is not a de Polignac number, because 217047293 - 2⁴ = 217047277 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (217047263) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108523646 + 108523647.

It is an arithmetic number, because the mean of its divisors is an integer number (108523647).

Almost surely, 2^217047293 is an apocalyptic number.

It is an amenable number.

217047293 is a deficient number, since it is larger than the sum of its proper divisors (1).

217047293 is an equidigital number, since it uses as much as digits as its factorization.

217047293 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 21168, while the sum is 35.

The square root of 217047293 is about 14732.5250042211. The cubic root of 217047293 is about 600.9681527011.

The spelling of 217047293 in words is "two hundred seventeen million, forty-seven thousand, two hundred ninety-three".