16317209 has 2 divisors, whose sum is σ = 16317210. Its totient is φ = 16317208.

The previous prime is 16317193. The next prime is 16317233. The reversal of 16317209 is 90271361.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15721225 + 595984 = 3965^2 + 772^2 .

It is an emirp because it is prime and its reverse (90271361) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 16317209 - 2⁴ = 16317193 is a prime.

It is a super-3 number, since 3×16317209³ (a number of 23 digits) contains 333 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (16317299) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8158604 + 8158605.

It is an arithmetic number, because the mean of its divisors is an integer number (8158605).

Almost surely, 2^16317209 is an apocalyptic number.

It is an amenable number.

16317209 is a deficient number, since it is larger than the sum of its proper divisors (1).

16317209 is an equidigital number, since it uses as much as digits as its factorization.

16317209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2268, while the sum is 29.

The square root of 16317209 is about 4039.4565228506. The cubic root of 16317209 is about 253.6385677178.

The spelling of 16317209 in words is "sixteen million, three hundred seventeen thousand, two hundred nine".