2009171 has 2 divisors, whose sum is σ = 2009172. Its totient is φ = 2009170.

The previous prime is 2009167. The next prime is 2009173. The reversal of 2009171 is 1719002.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2009171 - 2² = 2009167 is a prime.

Together with 2009173, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (2009173) 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, 1004585 + 1004586.

It is an arithmetic number, because the mean of its divisors is an integer number (1004586).

2^2009171 is an apocalyptic number.

2009171 is a deficient number, since it is larger than the sum of its proper divisors (1).

2009171 is an equidigital number, since it uses as much as digits as its factorization.

2009171 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 126, while the sum is 20.

The square root of 2009171 is about 1417.4522919661. The cubic root of 2009171 is about 126.1843903127.

The spelling of 2009171 in words is "two million, nine thousand, one hundred seventy-one".