2161311 has 16 divisors (see below), whose sum is σ = 2983680. Its totient is φ = 1391040.

The previous prime is 2161303. The next prime is 2161319. The reversal of 2161311 is 1131612.

It is an interprime number because it is at equal distance from previous prime (2161303) and next prime (2161319).

It is not a de Polignac number, because 2161311 - 2³ = 2161303 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2161319) 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 15 ways as a sum of consecutive naturals, for example, 15480 + ... + 15618.

It is an arithmetic number, because the mean of its divisors is an integer number (186480).

2^2161311 is an apocalyptic number.

2161311 is a deficient number, since it is larger than the sum of its proper divisors (822369).

2161311 is a wasteful number, since it uses less digits than its factorization.

2161311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 286.

The product of its digits is 36, while the sum is 15.

The square root of 2161311 is about 1470.1397892718. The cubic root of 2161311 is about 129.2922285560.

Adding to 2161311 its reverse (1131612), we get a palindrome (3292923).

The spelling of 2161311 in words is "two million, one hundred sixty-one thousand, three hundred eleven".