173123 has 4 divisors (see below), whose sum is σ = 177840. Its totient is φ = 168408.

The previous prime is 173099. The next prime is 173137. The reversal of 173123 is 321371.

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

It is a cyclic number.

It is not a de Polignac number, because 173123 - 2⁶ = 173059 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (173183) 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, 2303 + ... + 2376.

It is an arithmetic number, because the mean of its divisors is an integer number (44460).

2¹⁷³¹²³ is an apocalyptic number.

173123 is a deficient number, since it is larger than the sum of its proper divisors (4717).

173123 is an equidigital number, since it uses as much as digits as its factorization.

173123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4716.

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

The square root of 173123 is about 416.0805210533. The cubic root of 173123 is about 55.7337488745.

Adding to 173123 its reverse (321371), we get a palindrome (494494).

The spelling of 173123 in words is "one hundred seventy-three thousand, one hundred twenty-three", and thus it is an iban number.