12663881 has 2 divisors, whose sum is σ = 12663882. Its totient is φ = 12663880.

The previous prime is 12663877. The next prime is 12663883. The reversal of 12663881 is 18836621.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12138256 + 525625 = 3484^2 + 725^2 .

It is a cyclic number.

It is not a de Polignac number, because 12663881 - 2² = 12663877 is a prime.

It is a super-2 number, since 2×12663881² = 320747763964322, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 12663883, 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 (12663883) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6331940 + 6331941.

It is an arithmetic number, because the mean of its divisors is an integer number (6331941).

Almost surely, 2^12663881 is an apocalyptic number.

It is an amenable number.

12663881 is a deficient number, since it is larger than the sum of its proper divisors (1).

12663881 is an equidigital number, since it uses as much as digits as its factorization.

12663881 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13824, while the sum is 35.

The square root of 12663881 is about 3558.6347101100. The cubic root of 12663881 is about 233.0892656548.

The spelling of 12663881 in words is "twelve million, six hundred sixty-three thousand, eight hundred eighty-one".