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2173 = 4153

2173 has 4 divisors (see below), whose sum is σ = 2268. Its totient is φ = 2080.

The previous prime is 2161. The next prime is 2179. The reversal of 2173 is 3712.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 729 + 1444 = 27^2 + 38^2 .

It is a cyclic number.

It is not a de Polignac number, because 2173 - 25 = 2141 is a prime.

It is a Smith number, since the sum of its digits (13) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

2173 is a lucky number.

It is a plaindrome in base 15.

It is a nialpdrome in base 3 and base 13.

It is a zygodrome in base 3.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2179) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15 + ... + 67.

It is an arithmetic number, because the mean of its divisors is an integer number (567).

It is an amenable number.

2173 is a deficient number, since it is larger than the sum of its proper divisors (95).

2173 is an equidigital number, since it uses as much as digits as its factorization.

2173 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94.

The product of its digits is 42, while the sum is 13.

The square root of 2173 is about 46.6154480832. The cubic root of 2173 is about 12.9524892975.

Adding to 2173 its reverse (3712), we get a palindrome (5885).

The spelling of 2173 in words is "two thousand, one hundred seventy-three", and thus it is an iban number.

Divisors: 1 41 53 2173