231321443 has 2 divisors, whose sum is σ = 231321444. Its totient is φ = 231321442.

The previous prime is 231321407. The next prime is 231321469. The reversal of 231321443 is 344123132.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 231321443 - 2⁶ = 231321379 is a prime.

It is equal to p_12711308 and since 231321443 and 12711308 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (231321043) 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, 115660721 + 115660722.

It is an arithmetic number, because the mean of its divisors is an integer number (115660722).

Almost surely, 2^231321443 is an apocalyptic number.

231321443 is a deficient number, since it is larger than the sum of its proper divisors (1).

231321443 is an equidigital number, since it uses as much as digits as its factorization.

231321443 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1728, while the sum is 23.

The square root of 231321443 is about 15209.2551757146. The cubic root of 231321443 is about 613.8637163176.

Adding to 231321443 its reverse (344123132), we get a palindrome (575444575).

The spelling of 231321443 in words is "two hundred thirty-one million, three hundred twenty-one thousand, four hundred forty-three".