12881861 has 4 divisors (see below), whose sum is σ = 12936000. Its totient is φ = 12827724.

The previous prime is 12881839. The next prime is 12881899. The reversal of 12881861 is 16818821.

12881861 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 12881861 - 2¹⁴ = 12865477 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12881161) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26711 + ... + 27188.

It is an arithmetic number, because the mean of its divisors is an integer number (3234000).

Almost surely, 2^12881861 is an apocalyptic number.

It is an amenable number.

12881861 is a deficient number, since it is larger than the sum of its proper divisors (54139).

12881861 is an equidigital number, since it uses as much as digits as its factorization.

12881861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54138.

The product of its digits is 6144, while the sum is 35.

The square root of 12881861 is about 3589.1309533089. The cubic root of 12881861 is about 234.4190326988.

The spelling of 12881861 in words is "twelve million, eight hundred eighty-one thousand, eight hundred sixty-one".