16956809 has 2 divisors, whose sum is σ = 16956810. Its totient is φ = 16956808.

The previous prime is 16956791. The next prime is 16956827. The reversal of 16956809 is 90865961.

It is a balanced prime because it is at equal distance from previous prime (16956791) and next prime (16956827).

It can be written as a sum of positive squares in only one way, i.e., 16321600 + 635209 = 4040^2 + 797^2 .

It is a cyclic number.

It is not a de Polignac number, because 16956809 - 2¹² = 16952713 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 16956809.

It is not a weakly prime, because it can be changed into another prime (16956869) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8478404 + 8478405.

It is an arithmetic number, because the mean of its divisors is an integer number (8478405).

Almost surely, 2^16956809 is an apocalyptic number.

It is an amenable number.

16956809 is a deficient number, since it is larger than the sum of its proper divisors (1).

16956809 is an equidigital number, since it uses as much as digits as its factorization.

16956809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 116640, while the sum is 44.

The square root of 16956809 is about 4117.8646165215. The cubic root of 16956809 is about 256.9102170899.

The spelling of 16956809 in words is "sixteen million, nine hundred fifty-six thousand, eight hundred nine".