12804243989 has 2 divisors, whose sum is σ = 12804243990. Its totient is φ = 12804243988.

The previous prime is 12804243971. The next prime is 12804244009. The reversal of 12804243989 is 98934240821.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9211200625 + 3593043364 = 95975^2 + 59942^2 .

It is a cyclic number.

It is not a de Polignac number, because 12804243989 - 2³² = 8509276693 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12804243929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6402121994 + 6402121995.

It is an arithmetic number, because the mean of its divisors is an integer number (6402121995).

Almost surely, 2^12804243989 is an apocalyptic number.

It is an amenable number.

12804243989 is a deficient number, since it is larger than the sum of its proper divisors (1).

12804243989 is an equidigital number, since it uses as much as digits as its factorization.

12804243989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 995328, while the sum is 50.

The spelling of 12804243989 in words is "twelve billion, eight hundred four million, two hundred forty-three thousand, nine hundred eighty-nine".