16677209 has 2 divisors, whose sum is σ = 16677210. Its totient is φ = 16677208.

The previous prime is 16677191. The next prime is 16677211. The reversal of 16677209 is 90277661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14227984 + 2449225 = 3772^2 + 1565^2 .

It is an emirp because it is prime and its reverse (90277661) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 16677209 - 2²⁰ = 15628633 is a prime.

Together with 16677211, 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 (16677239) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8338604 + 8338605.

It is an arithmetic number, because the mean of its divisors is an integer number (8338605).

Almost surely, 2^16677209 is an apocalyptic number.

It is an amenable number.

16677209 is a deficient number, since it is larger than the sum of its proper divisors (1).

16677209 is an equidigital number, since it uses as much as digits as its factorization.

16677209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 31752, while the sum is 38.

The square root of 16677209 is about 4083.7738673928. The cubic root of 16677209 is about 255.4903240426.

The spelling of 16677209 in words is "sixteen million, six hundred seventy-seven thousand, two hundred nine".