216525 has 12 divisors (see below), whose sum is σ = 358112. Its totient is φ = 115440.

The previous prime is 216523. The next prime is 216551. The reversal of 216525 is 525612.

It is not a de Polignac number, because 216525 - 2¹ = 216523 is a prime.

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

It is a Duffinian number.

It is a Curzon number.

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

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1369 + ... + 1518.

2²¹⁶⁵²⁵ is an apocalyptic number.

216525 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

216525 is a deficient number, since it is larger than the sum of its proper divisors (141587).

216525 is a wasteful number, since it uses less digits than its factorization.

216525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2900 (or 2895 counting only the distinct ones).

The product of its digits is 600, while the sum is 21.

The square root of 216525 is about 465.3224688321. The cubic root of 216525 is about 60.0485717802.

It can be divided in two parts, 216 and 525, that added together give a triangular number (741 = T₃₈).

The spelling of 216525 in words is "two hundred sixteen thousand, five hundred twenty-five".