216542589 has 16 divisors (see below), whose sum is σ = 291078144. Its totient is φ = 143190000.

The previous prime is 216542587. The next prime is 216542591. The reversal of 216542589 is 985245612.

It is an interprime number because it is at equal distance from previous prime (216542587) and next prime (216542591).

It is not a de Polignac number, because 216542589 - 2¹ = 216542587 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 216542589.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216542587) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 287964 + ... + 288714.

It is an arithmetic number, because the mean of its divisors is an integer number (18192384).

Almost surely, 2^216542589 is an apocalyptic number.

It is an amenable number.

216542589 is a deficient number, since it is larger than the sum of its proper divisors (74535555).

216542589 is a wasteful number, since it uses less digits than its factorization.

216542589 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1408.

The product of its digits is 172800, while the sum is 42.

The square root of 216542589 is about 14715.3861315291. The cubic root of 216542589 is about 600.5019771367.

The spelling of 216542589 in words is "two hundred sixteen million, five hundred forty-two thousand, five hundred eighty-nine".