12171917171 has 2 divisors, whose sum is σ = 12171917172. Its totient is φ = 12171917170.

The previous prime is 12171917071. The next prime is 12171917201. The reversal of 12171917171 is 17171917121.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12171917171 is a prime.

It is not a weakly prime, because it can be changed into another prime (12171917071) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6085958585 + 6085958586.

It is an arithmetic number, because the mean of its divisors is an integer number (6085958586).

Almost surely, 2^12171917171 is an apocalyptic number.

12171917171 is a deficient number, since it is larger than the sum of its proper divisors (1).

12171917171 is an equidigital number, since it uses as much as digits as its factorization.

12171917171 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6174, while the sum is 38.

The spelling of 12171917171 in words is "twelve billion, one hundred seventy-one million, nine hundred seventeen thousand, one hundred seventy-one".