12881989 has 2 divisors, whose sum is σ = 12881990. Its totient is φ = 12881988.

The previous prime is 12881987. The next prime is 12881993. The reversal of 12881989 is 98918821.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12837889 + 44100 = 3583^2 + 210^2 .

It is a cyclic number.

It is not a de Polignac number, because 12881989 - 2¹ = 12881987 is a prime.

It is a super-2 number, since 2×12881989² = 331891281192242, which contains 22 as substring.

Together with 12881987, 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 (12881987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6440994 + 6440995.

It is an arithmetic number, because the mean of its divisors is an integer number (6440995).

Almost surely, 2^12881989 is an apocalyptic number.

It is an amenable number.

12881989 is a deficient number, since it is larger than the sum of its proper divisors (1).

12881989 is an equidigital number, since it uses as much as digits as its factorization.

12881989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 82944, while the sum is 46.

The square root of 12881989 is about 3589.1487848792. The cubic root of 12881989 is about 234.4198091274.

The spelling of 12881989 in words is "twelve million, eight hundred eighty-one thousand, nine hundred eighty-nine".