12771931 has 2 divisors, whose sum is σ = 12771932. Its totient is φ = 12771930.

The previous prime is 12771929. The next prime is 12771943. The reversal of 12771931 is 13917721.

12771931 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is a weak prime.

It is an emirp because it is prime and its reverse (13917721) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12771931 - 2¹ = 12771929 is a prime.

It is a super-2 number, since 2×12771931² = 326244442937522, which contains 22 as substring.

Together with 12771929, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 12771893 and 12771902.

It is not a weakly prime, because it can be changed into another prime (12771911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6385965 + 6385966.

It is an arithmetic number, because the mean of its divisors is an integer number (6385966).

Almost surely, 2^12771931 is an apocalyptic number.

12771931 is a deficient number, since it is larger than the sum of its proper divisors (1).

12771931 is an equidigital number, since it uses as much as digits as its factorization.

12771931 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 12771931 is about 3573.7838490877. The cubic root of 12771931 is about 233.7503058896.

The spelling of 12771931 in words is "twelve million, seven hundred seventy-one thousand, nine hundred thirty-one".