12882781 has 2 divisors, whose sum is σ = 12882782. Its totient is φ = 12882780.

The previous prime is 12882743. The next prime is 12882799. The reversal of 12882781 is 18728821.

12882781 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., 8173881 + 4708900 = 2859^2 + 2170^2 .

It is an emirp because it is prime and its reverse (18728821) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12882781 - 2⁹ = 12882269 is a prime.

It is a super-2 number, since 2×12882781² = 331932092587922, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 12882781.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12882721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6441390 + 6441391.

It is an arithmetic number, because the mean of its divisors is an integer number (6441391).

Almost surely, 2^12882781 is an apocalyptic number.

It is an amenable number.

12882781 is a deficient number, since it is larger than the sum of its proper divisors (1).

12882781 is an equidigital number, since it uses as much as digits as its factorization.

12882781 is an evil number, because the sum of its binary digits is even.

The product of its digits is 14336, while the sum is 37.

The square root of 12882781 is about 3589.2591157508. The cubic root of 12882781 is about 234.4246131652.

The spelling of 12882781 in words is "twelve million, eight hundred eighty-two thousand, seven hundred eighty-one".