2311811791171 has 2 divisors, whose sum is σ = 2311811791172. Its totient is φ = 2311811791170.

The previous prime is 2311811791169. The next prime is 2311811791183. The reversal of 2311811791171 is 1711971181132.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2311811791171 - 2¹ = 2311811791169 is a prime.

Together with 2311811791169, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (2311811791111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1155905895585 + 1155905895586.

It is an arithmetic number, because the mean of its divisors is an integer number (1155905895586).

Almost surely, 2^{2311811791171} is an apocalyptic number.

2311811791171 is a deficient number, since it is larger than the sum of its proper divisors (1).

2311811791171 is an equidigital number, since it uses as much as digits as its factorization.

2311811791171 is an evil number, because the sum of its binary digits is even.

The product of its digits is 21168, while the sum is 43.

The spelling of 2311811791171 in words is "two trillion, three hundred eleven billion, eight hundred eleven million, seven hundred ninety-one thousand, one hundred seventy-one".