12857791 has 2 divisors, whose sum is σ = 12857792. Its totient is φ = 12857790.

The previous prime is 12857771. The next prime is 12857827. The reversal of 12857791 is 19775821.

12857791 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 12857791 - 2⁹ = 12857279 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12857711) 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, 6428895 + 6428896.

It is an arithmetic number, because the mean of its divisors is an integer number (6428896).

Almost surely, 2^12857791 is an apocalyptic number.

12857791 is a deficient number, since it is larger than the sum of its proper divisors (1).

12857791 is an equidigital number, since it uses as much as digits as its factorization.

12857791 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 35280, while the sum is 40.

The square root of 12857791 is about 3585.7762060675. The cubic root of 12857791 is about 234.2729362064.

The spelling of 12857791 in words is "twelve million, eight hundred fifty-seven thousand, seven hundred ninety-one".