231212231 has 2 divisors, whose sum is σ = 231212232. Its totient is φ = 231212230.

The previous prime is 231212213. The next prime is 231212269. The reversal of 231212231 is 132212132.

Together with previous prime (231212213) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 231212231 - 2¹⁴ = 231195847 is a prime.

It is a super-2 number, since 2×231212231² = 106918191527994722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231212431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115606115 + 115606116.

It is an arithmetic number, because the mean of its divisors is an integer number (115606116).

Almost surely, 2^231212231 is an apocalyptic number.

231212231 is a deficient number, since it is larger than the sum of its proper divisors (1).

231212231 is an equidigital number, since it uses as much as digits as its factorization.

231212231 is an evil number, because the sum of its binary digits is even.

The product of its digits is 144, while the sum is 17.

The square root of 231212231 is about 15205.6644379652. The cubic root of 231212231 is about 613.7670948708.

Adding to 231212231 its reverse (132212132), we get a palindrome (363424363).

Subtracting from 231212231 its reverse (132212132), we obtain a palindrome (99000099).

It can be divided in two parts, 23121 and 2231, that added together give a palindrome (25352).

The spelling of 231212231 in words is "two hundred thirty-one million, two hundred twelve thousand, two hundred thirty-one".