16943309 has 2 divisors, whose sum is σ = 16943310. Its totient is φ = 16943308.

The previous prime is 16943263. The next prime is 16943321. The reversal of 16943309 is 90334961.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12802084 + 4141225 = 3578^2 + 2035^2 .

It is a cyclic number.

It is not a de Polignac number, because 16943309 - 2¹² = 16939213 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16943009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8471654 + 8471655.

It is an arithmetic number, because the mean of its divisors is an integer number (8471655).

Almost surely, 2^16943309 is an apocalyptic number.

It is an amenable number.

16943309 is a deficient number, since it is larger than the sum of its proper divisors (1).

16943309 is an equidigital number, since it uses as much as digits as its factorization.

16943309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 17496, while the sum is 35.

The square root of 16943309 is about 4116.2250910270. The cubic root of 16943309 is about 256.8420201245.

The spelling of 16943309 in words is "sixteen million, nine hundred forty-three thousand, three hundred nine".