12877981 has 2 divisors, whose sum is σ = 12877982. Its totient is φ = 12877980.

The previous prime is 12877979. The next prime is 12878017. The reversal of 12877981 is 18977821.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10208025 + 2669956 = 3195^2 + 1634^2 .

It is a cyclic number.

It is not a de Polignac number, because 12877981 - 2¹ = 12877979 is a prime.

It is a super-2 number, since 2×12877981² = 331684789272722, which contains 22 as substring.

Together with 12877979, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12877951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6438990 + 6438991.

It is an arithmetic number, because the mean of its divisors is an integer number (6438991).

Almost surely, 2^12877981 is an apocalyptic number.

It is an amenable number.

12877981 is a deficient number, since it is larger than the sum of its proper divisors (1).

12877981 is an equidigital number, since it uses as much as digits as its factorization.

12877981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 56448, while the sum is 43.

The square root of 12877981 is about 3588.5903917834. The cubic root of 12877981 is about 234.3954947648.

The spelling of 12877981 in words is "twelve million, eight hundred seventy-seven thousand, nine hundred eighty-one".