65217 has 4 divisors (see below), whose sum is σ = 86960. Its totient is φ = 43476.

The previous prime is 65213. The next prime is 65239. The reversal of 65217 is 71256.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 65217 - 2² = 65213 is a prime.

It is an Ulam number.

It is a D-number.

It is a Duffinian number.

65217 is a lucky number.

It is a plaindrome in base 15.

It is a nialpdrome in base 16.

It is a junction number, because it is equal to n+sod(n) for n = 65193 and 65202.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 65217.

It is not an unprimeable number, because it can be changed into a prime (65213) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10867 + ... + 10872.

It is an arithmetic number, because the mean of its divisors is an integer number (21740).

2⁶⁵²¹⁷ is an apocalyptic number.

It is an amenable number.

65217 is a deficient number, since it is larger than the sum of its proper divisors (21743).

65217 is a wasteful number, since it uses less digits than its factorization.

65217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21742.

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

The square root of 65217 is about 255.3761930956. The cubic root of 65217 is about 40.2519513476.

It can be divided in two parts, 65 and 217, that added together give a palindrome (282).

The spelling of 65217 in words is "sixty-five thousand, two hundred seventeen".