12811881 has 8 divisors (see below), whose sum is σ = 17671680. Its totient is φ = 8246672.

The previous prime is 12811873. The next prime is 12811889. The reversal of 12811881 is 18811821.

It is an interprime number because it is at equal distance from previous prime (12811873) and next prime (12811889).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 12811881 - 2³ = 12811873 is a prime.

It is a super-2 number, since 2×12811881² = 328288589516322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (12811889) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 73545 + ... + 73718.

It is an arithmetic number, because the mean of its divisors is an integer number (2208960).

Almost surely, 2^12811881 is an apocalyptic number.

It is an amenable number.

12811881 is a deficient number, since it is larger than the sum of its proper divisors (4859799).

12811881 is a wasteful number, since it uses less digits than its factorization.

12811881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 147295.

The product of its digits is 1024, while the sum is 30.

The square root of 12811881 is about 3579.3687991041. The cubic root of 12811881 is about 233.9937722062.

The spelling of 12811881 in words is "twelve million, eight hundred eleven thousand, eight hundred eighty-one".