12771391 has 2 divisors, whose sum is σ = 12771392. Its totient is φ = 12771390.

The previous prime is 12771337. The next prime is 12771419. The reversal of 12771391 is 19317721.

12771391 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 12771391 - 2¹⁵ = 12738623 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12771091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6385695 + 6385696.

It is an arithmetic number, because the mean of its divisors is an integer number (6385696).

Almost surely, 2^12771391 is an apocalyptic number.

12771391 is a deficient number, since it is larger than the sum of its proper divisors (1).

12771391 is an equidigital number, since it uses as much as digits as its factorization.

12771391 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2646, while the sum is 31.

The square root of 12771391 is about 3573.7082981128. The cubic root of 12771391 is about 233.7470115053.

The spelling of 12771391 in words is "twelve million, seven hundred seventy-one thousand, three hundred ninety-one".