2191171 has 2 divisors, whose sum is σ = 2191172. Its totient is φ = 2191170.

The previous prime is 2191169. The next prime is 2191193. The reversal of 2191171 is 1711912.

2191171 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an a-pointer prime, because the next prime (2191193) can be obtained adding 2191171 to its sum of digits (22).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2191171 - 2¹ = 2191169 is a prime.

Together with 2191169, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (2191121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1095585 + 1095586.

It is an arithmetic number, because the mean of its divisors is an integer number (1095586).

2^2191171 is an apocalyptic number.

2191171 is a deficient number, since it is larger than the sum of its proper divisors (1).

2191171 is an equidigital number, since it uses as much as digits as its factorization.

2191171 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 126, while the sum is 22.

The square root of 2191171 is about 1480.2604500560. The cubic root of 2191171 is about 129.8849277572.

The spelling of 2191171 in words is "two million, one hundred ninety-one thousand, one hundred seventy-one".