203123 has 4 divisors (see below), whose sum is σ = 204240. Its totient is φ = 202008.

The previous prime is 203117. The next prime is 203141. The reversal of 203123 is 321302.

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, and also an emirpimes, since its reverse is a distinct semiprime: 321302 = 2 ⋅160651.

It is a cyclic number.

It is not a de Polignac number, because 203123 - 2¹⁰ = 202099 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (203173) 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, 215 + ... + 672.

It is an arithmetic number, because the mean of its divisors is an integer number (51060).

2²⁰³¹²³ is an apocalyptic number.

203123 is a deficient number, since it is larger than the sum of its proper divisors (1117).

203123 is an equidigital number, since it uses as much as digits as its factorization.

203123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1116.

The product of its (nonzero) digits is 36, while the sum is 11.

The square root of 203123 is about 450.6916906268. The cubic root of 203123 is about 58.7831742624.

Adding to 203123 its reverse (321302), we get a palindrome (524425).

The spelling of 203123 in words is "two hundred three thousand, one hundred twenty-three", and thus it is an iban number.