217065 has 16 divisors (see below), whose sum is σ = 360000. Its totient is φ = 111552.

The previous prime is 217057. The next prime is 217069. The reversal of 217065 is 560712.

It is not a de Polignac number, because 217065 - 2³ = 217057 is a prime.

It is not an unprimeable number, because it can be changed into a prime (217069) 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, 186 + ... + 684.

It is an arithmetic number, because the mean of its divisors is an integer number (22500).

2²¹⁷⁰⁶⁵ is an apocalyptic number.

It is an amenable number.

217065 is a deficient number, since it is larger than the sum of its proper divisors (142935).

217065 is a wasteful number, since it uses less digits than its factorization.

217065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 536.

The product of its (nonzero) digits is 420, while the sum is 21.

The square root of 217065 is about 465.9023502838. The cubic root of 217065 is about 60.0984494844.

Adding to 217065 its reverse (560712), we get a palindrome (777777).

The spelling of 217065 in words is "two hundred seventeen thousand, sixty-five".