12113891 has 2 divisors, whose sum is σ = 12113892. Its totient is φ = 12113890.

The previous prime is 12113873. The next prime is 12113897. The reversal of 12113891 is 19831121.

It is a strong prime.

It is an emirp because it is prime and its reverse (19831121) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12113891 is a prime.

It is a super-3 number, since 3×12113891³ (a number of 22 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 12113891.

It is not a weakly prime, because it can be changed into another prime (12113897) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6056945 + 6056946.

It is an arithmetic number, because the mean of its divisors is an integer number (6056946).

Almost surely, 2^12113891 is an apocalyptic number.

12113891 is a deficient number, since it is larger than the sum of its proper divisors (1).

12113891 is an equidigital number, since it uses as much as digits as its factorization.

12113891 is an odious number, because the sum of its binary digits is odd.

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

The square root of 12113891 is about 3480.5015443180. The cubic root of 12113891 is about 229.6648616157.

The spelling of 12113891 in words is "twelve million, one hundred thirteen thousand, eight hundred ninety-one".