2161711 has 4 divisors (see below), whose sum is σ = 2202552. Its totient is φ = 2120872.

The previous prime is 2161699. The next prime is 2161729. The reversal of 2161711 is 1171612.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2161711 - 2⁹ = 2161199 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2161751) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20341 + ... + 20446.

It is an arithmetic number, because the mean of its divisors is an integer number (550638).

2^2161711 is an apocalyptic number.

2161711 is a deficient number, since it is larger than the sum of its proper divisors (40841).

2161711 is an equidigital number, since it uses as much as digits as its factorization.

2161711 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40840.

The product of its digits is 84, while the sum is 19.

The square root of 2161711 is about 1470.2758244629. The cubic root of 2161711 is about 129.3002042247.

Subtracting from 2161711 its reverse (1171612), we obtain a palindrome (990099).

The spelling of 2161711 in words is "two million, one hundred sixty-one thousand, seven hundred eleven".