2170871 has 2 divisors, whose sum is σ = 2170872. Its totient is φ = 2170870.

The previous prime is 2170829. The next prime is 2170877. The reversal of 2170871 is 1780712.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2170871 - 2¹⁴ = 2154487 is a prime.

It is a Chen prime.

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 2170871.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2170877) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1085435 + 1085436.

It is an arithmetic number, because the mean of its divisors is an integer number (1085436).

2^2170871 is an apocalyptic number.

2170871 is a deficient number, since it is larger than the sum of its proper divisors (1).

2170871 is an equidigital number, since it uses as much as digits as its factorization.

2170871 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 784, while the sum is 26.

The square root of 2170871 is about 1473.3875932693. The cubic root of 2170871 is about 129.4825784170.

The spelling of 2170871 in words is "two million, one hundred seventy thousand, eight hundred seventy-one".