12771191 has 2 divisors, whose sum is σ = 12771192. Its totient is φ = 12771190.

The previous prime is 12771151. The next prime is 12771193. The reversal of 12771191 is 19117721.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12771191 is a prime.

It is a Sophie Germain prime.

Together with 12771193, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12771193) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6385595 + 6385596.

It is an arithmetic number, because the mean of its divisors is an integer number (6385596).

Almost surely, 2^12771191 is an apocalyptic number.

12771191 is a deficient number, since it is larger than the sum of its proper divisors (1).

12771191 is an equidigital number, since it uses as much as digits as its factorization.

12771191 is an evil number, because the sum of its binary digits is even.

The product of its digits is 882, while the sum is 29.

The square root of 12771191 is about 3573.6803158649. The cubic root of 12771191 is about 233.7457913395.

The spelling of 12771191 in words is "twelve million, seven hundred seventy-one thousand, one hundred ninety-one".