12894521009 has 2 divisors, whose sum is σ = 12894521010. Its totient is φ = 12894521008.

The previous prime is 12894520987. The next prime is 12894521039. The reversal of 12894521009 is 90012549821.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12882250000 + 12271009 = 113500^2 + 3503^2 .

It is an emirp because it is prime and its reverse (90012549821) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12894521009 - 2²⁰ = 12893472433 is a prime.

It is not a weakly prime, because it can be changed into another prime (12894521039) 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, 6447260504 + 6447260505.

It is an arithmetic number, because the mean of its divisors is an integer number (6447260505).

Almost surely, 2^12894521009 is an apocalyptic number.

It is an amenable number.

12894521009 is a deficient number, since it is larger than the sum of its proper divisors (1).

12894521009 is an equidigital number, since it uses as much as digits as its factorization.

12894521009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 51840, while the sum is 41.

The spelling of 12894521009 in words is "twelve billion, eight hundred ninety-four million, five hundred twenty-one thousand, nine".