231123 has 4 divisors (see below), whose sum is σ = 308168. Its totient is φ = 154080.

The previous prime is 231109. The next prime is 231131. The reversal of 231123 is 321132.

It is a happy number.

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

It is not a de Polignac number, because 231123 - 2⁴ = 231107 is a prime.

It is a super-2 number, since 2×231123² = 106835682258, which contains 22 as substring.

It is a D-number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 231099 and 231108.

It is not an unprimeable number, because it can be changed into a prime (231223) 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, 38518 + ... + 38523.

It is an arithmetic number, because the mean of its divisors is an integer number (77042).

2²³¹¹²³ is an apocalyptic number.

231123 is a deficient number, since it is larger than the sum of its proper divisors (77045).

231123 is an equidigital number, since it uses as much as digits as its factorization.

231123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77044.

The product of its digits is 36, while the sum is 12.

The square root of 231123 is about 480.7525350947. The cubic root of 231123 is about 61.3688128318.

Adding to 231123 its reverse (321132), we get a palindrome (552255).

Subtracting 231123 from its reverse (321132), we obtain a palindrome (90009).

It can be divided in two parts, 2 and 31123, that added together give a triangular number (31125 = T₂₄₉).

The spelling of 231123 in words is "two hundred thirty-one thousand, one hundred twenty-three".