12771791 has 4 divisors (see below), whose sum is σ = 12925752. Its totient is φ = 12617832.

The previous prime is 12771769. The next prime is 12771799. The reversal of 12771791 is 19717721.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19717721 = 419 ⋅47059.

It is a cyclic number.

It is not a de Polignac number, because 12771791 - 2⁶ = 12771727 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12771799) 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 in 3 ways as a sum of consecutive naturals, for example, 76856 + ... + 77021.

It is an arithmetic number, because the mean of its divisors is an integer number (3231438).

Almost surely, 2^12771791 is an apocalyptic number.

12771791 is a deficient number, since it is larger than the sum of its proper divisors (153961).

12771791 is an equidigital number, since it uses as much as digits as its factorization.

12771791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 153960.

The product of its digits is 6174, while the sum is 35.

The square root of 12771791 is about 3573.7642619513. The cubic root of 12771791 is about 233.7494517989.

The spelling of 12771791 in words is "twelve million, seven hundred seventy-one thousand, seven hundred ninety-one".