231225331 has 2 divisors, whose sum is σ = 231225332. Its totient is φ = 231225330.

The previous prime is 231225329. The next prime is 231225353. The reversal of 231225331 is 133522132.

It is an a-pointer prime, because the next prime (231225353) can be obtained adding 231225331 to its sum of digits (22).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 231225331 - 2¹ = 231225329 is a prime.

It is a super-2 number, since 2×231225331² = 106930307392119122, which contains 22 as substring.

Together with 231225329, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (231225131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115612665 + 115612666.

It is an arithmetic number, because the mean of its divisors is an integer number (115612666).

Almost surely, 2^231225331 is an apocalyptic number.

231225331 is a deficient number, since it is larger than the sum of its proper divisors (1).

231225331 is an equidigital number, since it uses as much as digits as its factorization.

231225331 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1080, while the sum is 22.

The square root of 231225331 is about 15206.0951923891. The cubic root of 231225331 is about 613.7786862372.

Adding to 231225331 its reverse (133522132), we get a palindrome (364747463).

The spelling of 231225331 in words is "two hundred thirty-one million, two hundred twenty-five thousand, three hundred thirty-one".