216530539 has 4 divisors (see below), whose sum is σ = 216568240. Its totient is φ = 216492840.

The previous prime is 216530537. The next prime is 216530569. The reversal of 216530539 is 935035612.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 216530539 - 2¹ = 216530537 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (216530537) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8247 + ... + 22384.

It is an arithmetic number, because the mean of its divisors is an integer number (54142060).

Almost surely, 2^216530539 is an apocalyptic number.

216530539 is a deficient number, since it is larger than the sum of its proper divisors (37701).

216530539 is an equidigital number, since it uses as much as digits as its factorization.

216530539 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37700.

The product of its (nonzero) digits is 24300, while the sum is 34.

The square root of 216530539 is about 14714.9766904335. The cubic root of 216530539 is about 600.4908381685.

The spelling of 216530539 in words is "two hundred sixteen million, five hundred thirty thousand, five hundred thirty-nine".