216537 has 8 divisors (see below), whose sum is σ = 292320. Its totient is φ = 142560.

The previous prime is 216523. The next prime is 216551. The reversal of 216537 is 735612.

It is an interprime number because it is at equal distance from previous prime (216523) and next prime (216551).

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

It is not a de Polignac number, because 216537 - 2¹⁴ = 200153 is a prime.

It is not an unprimeable number, because it can be changed into a prime (216577) 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 7 ways as a sum of consecutive naturals, for example, 139 + ... + 672.

It is an arithmetic number, because the mean of its divisors is an integer number (36540).

2²¹⁶⁵³⁷ is an apocalyptic number.

It is an amenable number.

216537 is a deficient number, since it is larger than the sum of its proper divisors (75783).

216537 is an equidigital number, since it uses as much as digits as its factorization.

216537 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 903.

The product of its digits is 1260, while the sum is 24.

The square root of 216537 is about 465.3353629373. The cubic root of 216537 is about 60.0496810740.

The spelling of 216537 in words is "two hundred sixteen thousand, five hundred thirty-seven".