2161172 has 36 divisors (see below), whose sum is σ = 4304160. Its totient is φ = 947232.

The previous prime is 2161163. The next prime is 2161177. The reversal of 2161172 is 2711612.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2161177) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 15479 + ... + 15617.

It is an arithmetic number, because the mean of its divisors is an integer number (119560).

2^2161172 is an apocalyptic number.

It is an amenable number.

2161172 is a deficient number, since it is larger than the sum of its proper divisors (2142988).

2161172 is a wasteful number, since it uses less digits than its factorization.

2161172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 192 (or 177 counting only the distinct ones).

The product of its digits is 168, while the sum is 20.

The square root of 2161172 is about 1470.0925140956. The cubic root of 2161172 is about 129.2894567807.

Adding to 2161172 its reverse (2711612), we get a palindrome (4872784).

It can be divided in two parts, 216117 and 2, that multiplied together give a palindrome (432234).

The spelling of 2161172 in words is "two million, one hundred sixty-one thousand, one hundred seventy-two".