16397009 has 2 divisors, whose sum is σ = 16397010. Its totient is φ = 16397008.

The previous prime is 16396997. The next prime is 16397011. The reversal of 16397009 is 90079361.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16224784 + 172225 = 4028^2 + 415^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16397009 is a prime.

Together with 16397011, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 16397009.

It is not a weakly prime, because it can be changed into another prime (16397039) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8198504 + 8198505.

It is an arithmetic number, because the mean of its divisors is an integer number (8198505).

Almost surely, 2^16397009 is an apocalyptic number.

It is an amenable number.

16397009 is a deficient number, since it is larger than the sum of its proper divisors (1).

16397009 is an equidigital number, since it uses as much as digits as its factorization.

16397009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10206, while the sum is 35.

The square root of 16397009 is about 4049.3220420214. The cubic root of 16397009 is about 254.0513722119.

The spelling of 16397009 in words is "sixteen million, three hundred ninety-seven thousand, nine".