2161156 has 12 divisors (see below), whose sum is σ = 3794140. Its totient is φ = 1077120.

The previous prime is 2161141. The next prime is 2161157. The reversal of 2161156 is 6511612.

It can be written as a sum of positive squares in 2 ways, for example, as 1988100 + 173056 = 1410^2 + 416^2 .

It is a hoax number, since the sum of its digits (22) coincides with the sum of the digits of its distinct prime factors.

It is an Ulam number.

It is a plaindrome in base 11.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2161157) 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, 976 + ... + 2296.

2^2161156 is an apocalyptic number.

It is an amenable number.

2161156 is a deficient number, since it is larger than the sum of its proper divisors (1632984).

2161156 is a wasteful number, since it uses less digits than its factorization.

2161156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1734 (or 1732 counting only the distinct ones).

The product of its digits is 360, while the sum is 22.

The square root of 2161156 is about 1470.0870722512. The cubic root of 2161156 is about 129.2891377198.

Adding to 2161156 its reverse (6511612), we get a palindrome (8672768).

The spelling of 2161156 in words is "two million, one hundred sixty-one thousand, one hundred fifty-six".