231212233 has 6 divisors (see below), whose sum is σ = 268961226. Its totient is φ = 198181872.

The previous prime is 231212231. The next prime is 231212269. The reversal of 231212233 is 332212132.

It can be written as a sum of positive squares in only one way, i.e., 229461904 + 1750329 = 15148^2 + 1323^2 .

It is not a de Polignac number, because 231212233 - 2¹ = 231212231 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 231212233.

It is not an unprimeable number, because it can be changed into a prime (231212231) 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 5 ways as a sum of consecutive naturals, for example, 2359260 + ... + 2359357.

It is an arithmetic number, because the mean of its divisors is an integer number (44826871).

Almost surely, 2^231212233 is an apocalyptic number.

It is an amenable number.

231212233 is a deficient number, since it is larger than the sum of its proper divisors (37748993).

231212233 is an equidigital number, since it uses as much as digits as its factorization.

231212233 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4718631 (or 4718624 counting only the distinct ones).

The product of its digits is 432, while the sum is 19.

The square root of 231212233 is about 15205.6645037302. The cubic root of 231212233 is about 613.7670966405.

Adding to 231212233 its reverse (332212132), we get a palindrome (563424365).

The spelling of 231212233 in words is "two hundred thirty-one million, two hundred twelve thousand, two hundred thirty-three".