12947881 has 2 divisors, whose sum is σ = 12947882. Its totient is φ = 12947880.

The previous prime is 12947867. The next prime is 12947887. The reversal of 12947881 is 18874921.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8037225 + 4910656 = 2835^2 + 2216^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12947881 is a prime.

It is a super-2 number, since 2×12947881² = 335295244780322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (12947887) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6473940 + 6473941.

It is an arithmetic number, because the mean of its divisors is an integer number (6473941).

Almost surely, 2^12947881 is an apocalyptic number.

It is an amenable number.

12947881 is a deficient number, since it is larger than the sum of its proper divisors (1).

12947881 is an equidigital number, since it uses as much as digits as its factorization.

12947881 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 32256, while the sum is 40.

The square root of 12947881 is about 3598.3164118793. The cubic root of 12947881 is about 234.8188191536.

The spelling of 12947881 in words is "twelve million, nine hundred forty-seven thousand, eight hundred eighty-one".