12356891 has 2 divisors, whose sum is σ = 12356892. Its totient is φ = 12356890.

The previous prime is 12356887. The next prime is 12356893. The reversal of 12356891 is 19865321.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 12356891 - 2² = 12356887 is a prime.

Together with 12356893, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (12356893) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6178445 + 6178446.

It is an arithmetic number, because the mean of its divisors is an integer number (6178446).

Almost surely, 2^12356891 is an apocalyptic number.

12356891 is a deficient number, since it is larger than the sum of its proper divisors (1).

12356891 is an equidigital number, since it uses as much as digits as its factorization.

12356891 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12960, while the sum is 35.

The square root of 12356891 is about 3515.2369763645. The cubic root of 12356891 is about 231.1903692364.

The spelling of 12356891 in words is "twelve million, three hundred fifty-six thousand, eight hundred ninety-one".