12784510309 has 2 divisors, whose sum is σ = 12784510310. Its totient is φ = 12784510308.

The previous prime is 12784510261. The next prime is 12784510339. The reversal of 12784510309 is 90301548721.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7448207809 + 5336302500 = 86303^2 + 73050^2 .

It is an emirp because it is prime and its reverse (90301548721) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12784510309 - 2²¹ = 12782413157 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12784510339) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6392255154 + 6392255155.

It is an arithmetic number, because the mean of its divisors is an integer number (6392255155).

Almost surely, 2^12784510309 is an apocalyptic number.

It is an amenable number.

12784510309 is a deficient number, since it is larger than the sum of its proper divisors (1).

12784510309 is an equidigital number, since it uses as much as digits as its factorization.

12784510309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 60480, while the sum is 40.

The spelling of 12784510309 in words is "twelve billion, seven hundred eighty-four million, five hundred ten thousand, three hundred nine".