231213123 has 20 divisors (see below), whose sum is σ = 346903128. Its totient is φ = 153468000.

The previous prime is 231213113. The next prime is 231213127. The reversal of 231213123 is 321312132.

It is not a de Polignac number, because 231213123 - 2¹³ = 231204931 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 231213096 and 231213105.

It is not an unprimeable number, because it can be changed into a prime (231213127) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 12748 + ... + 24998.

Almost surely, 2^231213123 is an apocalyptic number.

231213123 is a deficient number, since it is larger than the sum of its proper divisors (115690005).

231213123 is a wasteful number, since it uses less digits than its factorization.

231213123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12496 (or 12487 counting only the distinct ones).

The product of its digits is 216, while the sum is 18.

The square root of 231213123 is about 15205.6937691116. The cubic root of 231213123 is about 613.7678841594.

Adding to 231213123 its reverse (321312132), we get a palindrome (552525255).

Subtracting 231213123 from its reverse (321312132), we obtain a palindrome (90099009).

It can be divided in two parts, 23121 and 3123, that added together give a square (26244 = 162²).

The spelling of 231213123 in words is "two hundred thirty-one million, two hundred thirteen thousand, one hundred twenty-three".