12113681 has 4 divisors (see below), whose sum is σ = 12121200. Its totient is φ = 12106164.

The previous prime is 12113669. The next prime is 12113723. The reversal of 12113681 is 18631121.

12113681 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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12113681 is a prime.

It is a super-2 number, since 2×12113681² = 293482534739522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12113581) 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, 251 + ... + 4928.

It is an arithmetic number, because the mean of its divisors is an integer number (3030300).

Almost surely, 2^12113681 is an apocalyptic number.

It is an amenable number.

12113681 is a deficient number, since it is larger than the sum of its proper divisors (7519).

12113681 is an equidigital number, since it uses as much as digits as its factorization.

12113681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7518.

The product of its digits is 288, while the sum is 23.

The square root of 12113681 is about 3480.4713761213. The cubic root of 12113681 is about 229.6635344918.

The spelling of 12113681 in words is "twelve million, one hundred thirteen thousand, six hundred eighty-one".