12881561 has 12 divisors (see below), whose sum is σ = 16347600. Its totient is φ = 10037160.

The previous prime is 12881551. The next prime is 12881579. The reversal of 12881561 is 16518821.

12881561 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a de Polignac number, because none of the positive numbers 2^k-12881561 is a prime.

It is a super-2 number, since 2×12881561² = 331869227593442, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12881501) 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 in 11 ways as a sum of consecutive naturals, for example, 11411 + ... + 12488.

It is an arithmetic number, because the mean of its divisors is an integer number (1362300).

Almost surely, 2^12881561 is an apocalyptic number.

12881561 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12881561 is a deficient number, since it is larger than the sum of its proper divisors (3466039).

12881561 is a wasteful number, since it uses less digits than its factorization.

12881561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23924 (or 23917 counting only the distinct ones).

The product of its digits is 3840, while the sum is 32.

The square root of 12881561 is about 3589.0891602188. The cubic root of 12881561 is about 234.4172129240.

The spelling of 12881561 in words is "twelve million, eight hundred eighty-one thousand, five hundred sixty-one".