12804509 has 2 divisors, whose sum is σ = 12804510. Its totient is φ = 12804508.

The previous prime is 12804487. The next prime is 12804523. The reversal of 12804509 is 90540821.

12804509 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10745284 + 2059225 = 3278^2 + 1435^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12804509 is a prime.

It is a Chen prime.

It is a plaindrome in base 15.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12804529) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6402254 + 6402255.

It is an arithmetic number, because the mean of its divisors is an integer number (6402255).

Almost surely, 2^12804509 is an apocalyptic number.

It is an amenable number.

12804509 is a deficient number, since it is larger than the sum of its proper divisors (1).

12804509 is an equidigital number, since it uses as much as digits as its factorization.

12804509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2880, while the sum is 29.

The square root of 12804509 is about 3578.3388604211. The cubic root of 12804509 is about 233.9488833240.

The spelling of 12804509 in words is "twelve million, eight hundred four thousand, five hundred nine".