216717 has 16 divisors (see below), whose sum is σ = 311040. Its totient is φ = 133952.

The previous prime is 216703. The next prime is 216719. The reversal of 216717 is 717612.

It is a cyclic number.

It is not a de Polignac number, because 216717 - 2⁶ = 216653 is a prime.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 216717.

It is not an unprimeable number, because it can be changed into a prime (216719) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4063 + ... + 4115.

It is an arithmetic number, because the mean of its divisors is an integer number (19440).

2²¹⁶⁷¹⁷ is an apocalyptic number.

It is an amenable number.

216717 is a deficient number, since it is larger than the sum of its proper divisors (94323).

216717 is a wasteful number, since it uses less digits than its factorization.

216717 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132.

The product of its digits is 588, while the sum is 24.

The square root of 216717 is about 465.5287316590. The cubic root of 216717 is about 60.0663155660.

The spelling of 216717 in words is "two hundred sixteen thousand, seven hundred seventeen".