217322393 has 2 divisors, whose sum is σ = 217322394. Its totient is φ = 217322392.

The previous prime is 217322359. The next prime is 217322411. The reversal of 217322393 is 393223712.

217322393 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 131148304 + 86174089 = 11452^2 + 9283^2 .

It is a cyclic number.

It is not a de Polignac number, because 217322393 - 2¹⁴ = 217306009 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 (217322093) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108661196 + 108661197.

It is an arithmetic number, because the mean of its divisors is an integer number (108661197).

Almost surely, 2^217322393 is an apocalyptic number.

It is an amenable number.

217322393 is a deficient number, since it is larger than the sum of its proper divisors (1).

217322393 is an equidigital number, since it uses as much as digits as its factorization.

217322393 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13608, while the sum is 32.

The square root of 217322393 is about 14741.8585327631. The cubic root of 217322393 is about 601.2219476800.

The spelling of 217322393 in words is "two hundred seventeen million, three hundred twenty-two thousand, three hundred ninety-three".