12118913 has 4 divisors (see below), whose sum is σ = 12265008. Its totient is φ = 11972820.

The previous prime is 12118891. The next prime is 12118921. The reversal of 12118913 is 31981121.

12118913 is digitally balanced in base 2 and base 3, because in such bases 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 an emirpimes, since its reverse is a distinct semiprime: 31981121 = 43 ⋅743747.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12118913 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (12118933) 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, 72923 + ... + 73088.

It is an arithmetic number, because the mean of its divisors is an integer number (3066252).

Almost surely, 2^12118913 is an apocalyptic number.

It is an amenable number.

12118913 is a deficient number, since it is larger than the sum of its proper divisors (146095).

12118913 is an equidigital number, since it uses as much as digits as its factorization.

12118913 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 146094.

The product of its digits is 432, while the sum is 26.

The square root of 12118913 is about 3481.2229173094. Note that the first 3 decimals coincide. The cubic root of 12118913 is about 229.6965942656.

It can be divided in two parts, 12118 and 913, that added together give a palindrome (13031).

The spelling of 12118913 in words is "twelve million, one hundred eighteen thousand, nine hundred thirteen".