231033213 has 12 divisors (see below), whose sum is σ = 353345148. Its totient is φ = 144961920.

The previous prime is 231033197. The next prime is 231033233. The reversal of 231033213 is 312330132.

It can be written as a sum of positive squares in 2 ways, for example, as 127848249 + 103184964 = 11307^2 + 10158^2 .

It is not a de Polignac number, because 231033213 - 2⁴ = 231033197 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231033233) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 754858 + ... + 755163.

It is an arithmetic number, because the mean of its divisors is an integer number (29445429).

Almost surely, 2^231033213 is an apocalyptic number.

It is an amenable number.

231033213 is a deficient number, since it is larger than the sum of its proper divisors (122311935).

231033213 is a wasteful number, since it uses less digits than its factorization.

231033213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1510044 (or 1510041 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 18.

The square root of 231033213 is about 15199.7767417814. The cubic root of 231033213 is about 613.6086492055.

Adding to 231033213 its reverse (312330132), we get a palindrome (543363345).

The spelling of 231033213 in words is "two hundred thirty-one million, thirty-three thousand, two hundred thirteen".