123173 has 4 divisors (see below), whose sum is σ = 126540. Its totient is φ = 119808.

The previous prime is 123169. The next prime is 123191. The reversal of 123173 is 371321.

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

It can be written as a sum of positive squares in 2 ways, for example, as 82369 + 40804 = 287^2 + 202^2 .

It is a cyclic number.

It is not a de Polignac number, because 123173 - 2² = 123169 is a prime.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123113) 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, 1628 + ... + 1701.

It is an arithmetic number, because the mean of its divisors is an integer number (31635).

2¹²³¹⁷³ is an apocalyptic number.

It is an amenable number.

123173 is a deficient number, since it is larger than the sum of its proper divisors (3367).

123173 is an equidigital number, since it uses as much as digits as its factorization.

123173 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3366.

The product of its digits is 126, while the sum is 17.

The square root of 123173 is about 350.9601116936. The cubic root of 123173 is about 49.7552034489.

Adding to 123173 its reverse (371321), we get a palindrome (494494).

The spelling of 123173 in words is "one hundred twenty-three thousand, one hundred seventy-three", and thus it is an iban number.