12118891 has 2 divisors, whose sum is σ = 12118892. Its totient is φ = 12118890.

The previous prime is 12118871. The next prime is 12118921. The reversal of 12118891 is 19881121.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 12118891 - 2¹¹ = 12116843 is a prime.

It is not a weakly prime, because it can be changed into another prime (12118801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6059445 + 6059446.

It is an arithmetic number, because the mean of its divisors is an integer number (6059446).

Almost surely, 2^12118891 is an apocalyptic number.

12118891 is a deficient number, since it is larger than the sum of its proper divisors (1).

12118891 is an equidigital number, since it uses as much as digits as its factorization.

12118891 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1152, while the sum is 31.

The square root of 12118891 is about 3481.2197574988. The cubic root of 12118891 is about 229.6964552727.

The spelling of 12118891 in words is "twelve million, one hundred eighteen thousand, eight hundred ninety-one".