216501306 has 24 divisors (see below), whose sum is σ = 503697600. Its totient is φ = 61857432.

The previous prime is 216501301. The next prime is 216501331. The reversal of 216501306 is 603105612.

216501306 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (216501301) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 367906 + ... + 368493.

It is an arithmetic number, because the mean of its divisors is an integer number (20987400).

Almost surely, 2^216501306 is an apocalyptic number.

216501306 is an abundant number, since it is smaller than the sum of its proper divisors (287196294).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

216501306 is a wasteful number, since it uses less digits than its factorization.

216501306 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 736418 (or 736411 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 24.

The square root of 216501306 is about 14713.9833491818. The cubic root of 216501306 is about 600.4638135914.

Adding to 216501306 its reverse (603105612), we get a palindrome (819606918).

The spelling of 216501306 in words is "two hundred sixteen million, five hundred one thousand, three hundred six".