12809781233 has 2 divisors, whose sum is σ = 12809781234. Its totient is φ = 12809781232.

The previous prime is 12809781223. The next prime is 12809781241. The reversal of 12809781233 is 33218790821.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11186658289 + 1623122944 = 105767^2 + 40288^2 .

It is a cyclic number.

It is not a de Polignac number, because 12809781233 - 2²⁴ = 12793004017 is a prime.

It is not a weakly prime, because it can be changed into another prime (12809781223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6404890616 + 6404890617.

It is an arithmetic number, because the mean of its divisors is an integer number (6404890617).

Almost surely, 2^12809781233 is an apocalyptic number.

It is an amenable number.

12809781233 is a deficient number, since it is larger than the sum of its proper divisors (1).

12809781233 is an equidigital number, since it uses as much as digits as its factorization.

12809781233 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 145152, while the sum is 44.

The spelling of 12809781233 in words is "twelve billion, eight hundred nine million, seven hundred eighty-one thousand, two hundred thirty-three".