12881661 has 32 divisors (see below), whose sum is σ = 19407360. Its totient is φ = 7547904.

The previous prime is 12881657. The next prime is 12881663. The reversal of 12881661 is 16618821.

It is not a de Polignac number, because 12881661 - 2² = 12881657 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12881663) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 113941 + ... + 114053.

It is an arithmetic number, because the mean of its divisors is an integer number (606480).

Almost surely, 2^12881661 is an apocalyptic number.

It is an amenable number.

12881661 is a deficient number, since it is larger than the sum of its proper divisors (6525699).

12881661 is a wasteful number, since it uses less digits than its factorization.

12881661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 245.

The product of its digits is 4608, while the sum is 33.

The square root of 12881661 is about 3589.1030913029. The cubic root of 12881661 is about 234.4178195188.

The spelling of 12881661 in words is "twelve million, eight hundred eighty-one thousand, six hundred sixty-one".