12718891 has 2 divisors, whose sum is σ = 12718892. Its totient is φ = 12718890.

The previous prime is 12718879. The next prime is 12718933. The reversal of 12718891 is 19881721.

12718891 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 12718891 - 2⁵ = 12718859 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12718891.

It is not a weakly prime, because it can be changed into another prime (12718801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6359445 + 6359446.

It is an arithmetic number, because the mean of its divisors is an integer number (6359446).

Almost surely, 2^12718891 is an apocalyptic number.

12718891 is a deficient number, since it is larger than the sum of its proper divisors (1).

12718891 is an equidigital number, since it uses as much as digits as its factorization.

12718891 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8064, while the sum is 37.

The square root of 12718891 is about 3566.3554225568. The cubic root of 12718891 is about 233.4262797507.

The spelling of 12718891 in words is "twelve million, seven hundred eighteen thousand, eight hundred ninety-one".