231404441 has 2 divisors, whose sum is σ = 231404442. Its totient is φ = 231404440.

The previous prime is 231404423. The next prime is 231404443. The reversal of 231404441 is 144404132.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 213043216 + 18361225 = 14596^2 + 4285^2 .

It is a cyclic number.

It is not a de Polignac number, because 231404441 - 2⁶ = 231404377 is a prime.

Together with 231404443, 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 (231404443) 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, 115702220 + 115702221.

It is an arithmetic number, because the mean of its divisors is an integer number (115702221).

Almost surely, 2^231404441 is an apocalyptic number.

It is an amenable number.

231404441 is a deficient number, since it is larger than the sum of its proper divisors (1).

231404441 is an equidigital number, since it uses as much as digits as its factorization.

231404441 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1536, while the sum is 23.

The square root of 231404441 is about 15211.9834669908. The cubic root of 231404441 is about 613.9371255207.

Adding to 231404441 its reverse (144404132), we get a palindrome (375808573).

The spelling of 231404441 in words is "two hundred thirty-one million, four hundred four thousand, four hundred forty-one".