12778771 has 2 divisors, whose sum is σ = 12778772. Its totient is φ = 12778770.

The previous prime is 12778769. The next prime is 12778813. The reversal of 12778771 is 17787721.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 12778771 - 2¹ = 12778769 is a prime.

Together with 12778769, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (12778741) 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, 6389385 + 6389386.

It is an arithmetic number, because the mean of its divisors is an integer number (6389386).

Almost surely, 2^12778771 is an apocalyptic number.

12778771 is a deficient number, since it is larger than the sum of its proper divisors (1).

12778771 is an equidigital number, since it uses as much as digits as its factorization.

12778771 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 38416, while the sum is 40.

The square root of 12778771 is about 3574.7406898963. The cubic root of 12778771 is about 233.7920267214.

It can be divided in two parts, 1 and 2778771, that added together give a palindrome (2778772).

The spelling of 12778771 in words is "twelve million, seven hundred seventy-eight thousand, seven hundred seventy-one".