2165671 has 2 divisors, whose sum is σ = 2165672. Its totient is φ = 2165670.

The previous prime is 2165663. The next prime is 2165687. The reversal of 2165671 is 1765612.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2165671 - 2³ = 2165663 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2165651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1082835 + 1082836.

It is an arithmetic number, because the mean of its divisors is an integer number (1082836).

2^2165671 is an apocalyptic number.

2165671 is a deficient number, since it is larger than the sum of its proper divisors (1).

2165671 is an equidigital number, since it uses as much as digits as its factorization.

2165671 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2520, while the sum is 28.

The square root of 2165671 is about 1471.6218943737. The cubic root of 2165671 is about 129.3791103115.

The spelling of 2165671 in words is "two million, one hundred sixty-five thousand, six hundred seventy-one".