16345309 has 2 divisors, whose sum is σ = 16345310. Its totient is φ = 16345308.

The previous prime is 16345283. The next prime is 16345321. The reversal of 16345309 is 90354361.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11492100 + 4853209 = 3390^2 + 2203^2 .

It is a cyclic number.

It is not a de Polignac number, because 16345309 - 2¹³ = 16337117 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16345349) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8172654 + 8172655.

It is an arithmetic number, because the mean of its divisors is an integer number (8172655).

Almost surely, 2^16345309 is an apocalyptic number.

It is an amenable number.

16345309 is a deficient number, since it is larger than the sum of its proper divisors (1).

16345309 is an equidigital number, since it uses as much as digits as its factorization.

16345309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9720, while the sum is 31.

The square root of 16345309 is about 4042.9332173559. The cubic root of 16345309 is about 253.7840819081.

The spelling of 16345309 in words is "sixteen million, three hundred forty-five thousand, three hundred nine".