12971111 has 2 divisors, whose sum is σ = 12971112. Its totient is φ = 12971110.

The previous prime is 12971093. The next prime is 12971117. The reversal of 12971111 is 11117921.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12971111 is a prime.

It is a Sophie Germain 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 (12971117) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6485555 + 6485556.

It is an arithmetic number, because the mean of its divisors is an integer number (6485556).

Almost surely, 2^12971111 is an apocalyptic number.

12971111 is a deficient number, since it is larger than the sum of its proper divisors (1).

12971111 is an equidigital number, since it uses as much as digits as its factorization.

12971111 is an evil number, because the sum of its binary digits is even.

The product of its digits is 126, while the sum is 23.

The square root of 12971111 is about 3601.5428638293. The cubic root of 12971111 is about 234.9591659848.

The spelling of 12971111 in words is "twelve million, nine hundred seventy-one thousand, one hundred eleven".