12881689 has 2 divisors, whose sum is σ = 12881690. Its totient is φ = 12881688.

The previous prime is 12881669. The next prime is 12881711. The reversal of 12881689 is 98618821.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9659664 + 3222025 = 3108^2 + 1795^2 .

It is a cyclic number.

It is not a de Polignac number, because 12881689 - 2⁵ = 12881657 is a prime.

It is a super-2 number, since 2×12881689² = 331875822985442, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (12881629) 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, 6440844 + 6440845.

It is an arithmetic number, because the mean of its divisors is an integer number (6440845).

Almost surely, 2^12881689 is an apocalyptic number.

It is an amenable number.

12881689 is a deficient number, since it is larger than the sum of its proper divisors (1).

12881689 is an equidigital number, since it uses as much as digits as its factorization.

12881689 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 55296, while the sum is 43.

The square root of 12881689 is about 3589.1069919968. The cubic root of 12881689 is about 234.4179893647.

The spelling of 12881689 in words is "twelve million, eight hundred eighty-one thousand, six hundred eighty-nine".