16980209 has 2 divisors, whose sum is σ = 16980210. Its totient is φ = 16980208.

The previous prime is 16980203. The next prime is 16980277. The reversal of 16980209 is 90208961.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13667809 + 3312400 = 3697^2 + 1820^2 .

It is an emirp because it is prime and its reverse (90208961) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16980209 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (16980203) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8490104 + 8490105.

It is an arithmetic number, because the mean of its divisors is an integer number (8490105).

Almost surely, 2^16980209 is an apocalyptic number.

It is an amenable number.

16980209 is a deficient number, since it is larger than the sum of its proper divisors (1).

16980209 is an equidigital number, since it uses as much as digits as its factorization.

16980209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7776, while the sum is 35.

The square root of 16980209 is about 4120.7049154241. The cubic root of 16980209 is about 257.0283394690.

The spelling of 16980209 in words is "sixteen million, nine hundred eighty thousand, two hundred nine".