216529 has 8 divisors (see below), whose sum is σ = 235008. Its totient is φ = 198720.

The previous prime is 216523. The next prime is 216551. The reversal of 216529 is 925612.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 216529 - 2⁷ = 216401 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a nialpdrome in base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216523) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 664 + ... + 934.

It is an arithmetic number, because the mean of its divisors is an integer number (29376).

2²¹⁶⁵²⁹ is an apocalyptic number.

It is an amenable number.

216529 is a deficient number, since it is larger than the sum of its proper divisors (18479).

216529 is a wasteful number, since it uses less digits than its factorization.

216529 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 335.

The product of its digits is 1080, while the sum is 25.

The square root of 216529 is about 465.3267669069. The cubic root of 216529 is about 60.0489415494.

The spelling of 216529 in words is "two hundred sixteen thousand, five hundred twenty-nine".