2172871 has 2 divisors, whose sum is σ = 2172872. Its totient is φ = 2172870.

The previous prime is 2172869. The next prime is 2172887. The reversal of 2172871 is 1782712.

2172871 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2172871 - 2¹ = 2172869 is a prime.

Together with 2172869, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2172811) 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, 1086435 + 1086436.

It is an arithmetic number, because the mean of its divisors is an integer number (1086436).

2^2172871 is an apocalyptic number.

2172871 is a deficient number, since it is larger than the sum of its proper divisors (1).

2172871 is an equidigital number, since it uses as much as digits as its factorization.

2172871 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1568, while the sum is 28.

The square root of 2172871 is about 1474.0661450559. The cubic root of 2172871 is about 129.5223298455.

The spelling of 2172871 in words is "two million, one hundred seventy-two thousand, eight hundred seventy-one".