216534 has 16 divisors (see below), whose sum is σ = 437760. Its totient is φ = 71400.

The previous prime is 216523. The next prime is 216551. The reversal of 216534 is 435612.

It is a happy number.

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 216534.

It is a congruent number.

It is an unprimeable number.

216534 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 787 + ... + 1025.

It is an arithmetic number, because the mean of its divisors is an integer number (27360).

2²¹⁶⁵³⁴ is an apocalyptic number.

216534 is an abundant number, since it is smaller than the sum of its proper divisors (221226).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

216534 is a wasteful number, since it uses less digits than its factorization.

216534 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 395.

The product of its digits is 720, while the sum is 21.

The square root of 216534 is about 465.3321394445. The cubic root of 216534 is about 60.0494037544.

It can be divided in two parts, 21 and 6534, that added together give a triangular number (6555 = T₁₁₄).

The spelling of 216534 in words is "two hundred sixteen thousand, five hundred thirty-four".