15680009 has 2 divisors, whose sum is σ = 15680010. Its totient is φ = 15680008.

The previous prime is 15680003. The next prime is 15680011. The reversal of 15680009 is 90008651.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14227984 + 1452025 = 3772^2 + 1205^2 .

It is an emirp because it is prime and its reverse (90008651) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 15680009 - 2²⁰ = 14631433 is a prime.

Together with 15680011, it forms a pair of twin primes.

It is a Chen prime.

It is a plaindrome in base 15.

It is not a weakly prime, because it can be changed into another prime (15680003) 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, 7840004 + 7840005.

It is an arithmetic number, because the mean of its divisors is an integer number (7840005).

Almost surely, 2^15680009 is an apocalyptic number.

It is an amenable number.

15680009 is a deficient number, since it is larger than the sum of its proper divisors (1).

15680009 is an equidigital number, since it uses as much as digits as its factorization.

15680009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2160, while the sum is 29.

The square root of 15680009 is about 3959.7991110661. The cubic root of 15680009 is about 250.2930377147.

The spelling of 15680009 in words is "fifteen million, six hundred eighty thousand, nine".