216230009 has 2 divisors, whose sum is σ = 216230010. Its totient is φ = 216230008.

The previous prime is 216229999. The next prime is 216230011. The reversal of 216230009 is 900032612.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 215502400 + 727609 = 14680^2 + 853^2 .

It is a cyclic number.

It is not a de Polignac number, because 216230009 - 2¹² = 216225913 is a prime.

Together with 216230011, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (216230029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108115004 + 108115005.

It is an arithmetic number, because the mean of its divisors is an integer number (108115005).

Almost surely, 2^216230009 is an apocalyptic number.

It is an amenable number.

216230009 is a deficient number, since it is larger than the sum of its proper divisors (1).

216230009 is an equidigital number, since it uses as much as digits as its factorization.

216230009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 648, while the sum is 23.

The square root of 216230009 is about 14704.7614397514. The cubic root of 216230009 is about 600.2128957464.

The spelling of 216230009 in words is "two hundred sixteen million, two hundred thirty thousand, nine".