2161071 has 24 divisors (see below), whose sum is σ = 3459456. Its totient is φ = 1289040.

The previous prime is 2161031. The next prime is 2161087. The reversal of 2161071 is 1701612.

It is not a de Polignac number, because 2161071 - 2⁶ = 2161007 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2161001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8086 + ... + 8348.

It is an arithmetic number, because the mean of its divisors is an integer number (144144).

2^2161071 is an apocalyptic number.

2161071 is a deficient number, since it is larger than the sum of its proper divisors (1298385).

2161071 is a wasteful number, since it uses less digits than its factorization.

2161071 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 363 (or 360 counting only the distinct ones).

The product of its (nonzero) digits is 84, while the sum is 18.

The square root of 2161071 is about 1470.0581621147. The cubic root of 2161071 is about 129.2874426824.

Adding to 2161071 its reverse (1701612), we get a palindrome (3862683).

The spelling of 2161071 in words is "two million, one hundred sixty-one thousand, seventy-one".