216535 has 16 divisors (see below), whose sum is σ = 294912. Its totient is φ = 151200.

The previous prime is 216523. The next prime is 216551. The reversal of 216535 is 535612.

It is a happy number.

It is not a de Polignac number, because 216535 - 2⁹ = 216023 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1642 + ... + 1768.

It is an arithmetic number, because the mean of its divisors is an integer number (18432).

2²¹⁶⁵³⁵ is an apocalyptic number.

216535 is a deficient number, since it is larger than the sum of its proper divisors (78377).

216535 is a wasteful number, since it uses less digits than its factorization.

216535 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 174.

The product of its digits is 900, while the sum is 22.

The square root of 216535 is about 465.3332139446. Note that the first 3 decimals coincide. The cubic root of 216535 is about 60.0494961946.

It can be divided in two parts, 21 and 6535, that added together give a palindrome (6556).

The spelling of 216535 in words is "two hundred sixteen thousand, five hundred thirty-five".