12778481 has 2 divisors, whose sum is σ = 12778482. Its totient is φ = 12778480.

The previous prime is 12778477. The next prime is 12778483. The reversal of 12778481 is 18487721.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10137856 + 2640625 = 3184^2 + 1625^2 .

It is a cyclic number.

It is not a de Polignac number, because 12778481 - 2² = 12778477 is a prime.

It is a super-2 number, since 2×12778481² = 326579153334722, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 12778483, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (12778483) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6389240 + 6389241.

It is an arithmetic number, because the mean of its divisors is an integer number (6389241).

Almost surely, 2^12778481 is an apocalyptic number.

It is an amenable number.

12778481 is a deficient number, since it is larger than the sum of its proper divisors (1).

12778481 is an equidigital number, since it uses as much as digits as its factorization.

12778481 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 25088, while the sum is 38.

The square root of 12778481 is about 3574.7001272834. The cubic root of 12778481 is about 233.7902581580.

The spelling of 12778481 in words is "twelve million, seven hundred seventy-eight thousand, four hundred eighty-one".