216307009 has 2 divisors, whose sum is σ = 216307010. Its totient is φ = 216307008.

The previous prime is 216306989. The next prime is 216307033. The reversal of 216307009 is 900703612.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 215502400 + 804609 = 14680^2 + 897^2 .

It is a cyclic number.

It is not a de Polignac number, because 216307009 - 2¹¹ = 216304961 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (216307079) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108153504 + 108153505.

It is an arithmetic number, because the mean of its divisors is an integer number (108153505).

Almost surely, 2^216307009 is an apocalyptic number.

It is an amenable number.

216307009 is a deficient number, since it is larger than the sum of its proper divisors (1).

216307009 is an equidigital number, since it uses as much as digits as its factorization.

216307009 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 216307009 is about 14707.3794062709. The cubic root of 216307009 is about 600.2841330187.

The spelling of 216307009 in words is "two hundred sixteen million, three hundred seven thousand, nine".