12775981 has 2 divisors, whose sum is σ = 12775982. Its totient is φ = 12775980.

The previous prime is 12775951. The next prime is 12775991. The reversal of 12775981 is 18957721.

12775981 is digitally balanced in base 2, because in such base 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., 7672900 + 5103081 = 2770^2 + 2259^2 .

It is an emirp because it is prime and its reverse (18957721) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12775981 - 2⁷ = 12775853 is a prime.

It is a super-2 number, since 2×12775981² = 326451381024722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12775951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6387990 + 6387991.

It is an arithmetic number, because the mean of its divisors is an integer number (6387991).

Almost surely, 2^12775981 is an apocalyptic number.

It is an amenable number.

12775981 is a deficient number, since it is larger than the sum of its proper divisors (1).

12775981 is an equidigital number, since it uses as much as digits as its factorization.

12775981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 35280, while the sum is 40.

The square root of 12775981 is about 3574.3504304978. The cubic root of 12775981 is about 233.7750108119.

The spelling of 12775981 in words is "twelve million, seven hundred seventy-five thousand, nine hundred eighty-one".