216730009 has 2 divisors, whose sum is σ = 216730010. Its totient is φ = 216730008.

The previous prime is 216730001. The next prime is 216730039. The reversal of 216730009 is 900037612.

216730009 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 214915600 + 1814409 = 14660^2 + 1347^2 .

It is a cyclic number.

It is not a de Polignac number, because 216730009 - 2³ = 216730001 is a prime.

It is a super-2 number, since 2×216730009² = 93943793602280162, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (216730001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108365004 + 108365005.

It is an arithmetic number, because the mean of its divisors is an integer number (108365005).

Almost surely, 2^216730009 is an apocalyptic number.

It is an amenable number.

216730009 is a deficient number, since it is larger than the sum of its proper divisors (1).

216730009 is an equidigital number, since it uses as much as digits as its factorization.

216730009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2268, while the sum is 28.

The square root of 216730009 is about 14721.7529187254. The cubic root of 216730009 is about 600.6751742073.

The spelling of 216730009 in words is "two hundred sixteen million, seven hundred thirty thousand, nine".