217697 has 2 divisors, whose sum is σ = 217698. Its totient is φ = 217696.

The previous prime is 217691. The next prime is 217717. The reversal of 217697 is 796712.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 215296 + 2401 = 464^2 + 49^2 .

It is a cyclic number.

It is not a de Polignac number, because 217697 - 2⁴ = 217681 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (217691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108848 + 108849.

It is an arithmetic number, because the mean of its divisors is an integer number (108849).

2²¹⁷⁶⁹⁷ is an apocalyptic number.

It is an amenable number.

217697 is a deficient number, since it is larger than the sum of its proper divisors (1).

217697 is an equidigital number, since it uses as much as digits as its factorization.

217697 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5292, while the sum is 32.

The square root of 217697 is about 466.5801110206. The cubic root of 217697 is about 60.1567199210.

The spelling of 217697 in words is "two hundred seventeen thousand, six hundred ninety-seven".