123231 has 4 divisors (see below), whose sum is σ = 164312. Its totient is φ = 82152.

The previous prime is 123229. The next prime is 123239. The reversal of 123231 is 132321.

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 123231 - 2¹ = 123229 is a prime.

It is a super-2 number, since 2×123231² = 30371758722, which contains 22 as substring.

It is a D-number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123239) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20536 + ... + 20541.

It is an arithmetic number, because the mean of its divisors is an integer number (41078).

2¹²³²³¹ is an apocalyptic number.

123231 is a deficient number, since it is larger than the sum of its proper divisors (41081).

123231 is an equidigital number, since it uses as much as digits as its factorization.

123231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41080.

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

The square root of 123231 is about 351.0427324415. The cubic root of 123231 is about 49.7630118403.

Adding to 123231 its reverse (132321), we get a palindrome (255552).

It can be divided in two parts, 1 and 23231, that added together give a palindrome (23232).

The spelling of 123231 in words is "one hundred twenty-three thousand, two hundred thirty-one".