231321043 has 2 divisors, whose sum is σ = 231321044. Its totient is φ = 231321042.

The previous prime is 231321019. The next prime is 231321047. The reversal of 231321043 is 340123132.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-231321043 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 231321043.

It is not a weakly prime, because it can be changed into another prime (231321047) 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, 115660521 + 115660522.

It is an arithmetic number, because the mean of its divisors is an integer number (115660522).

Almost surely, 2^231321043 is an apocalyptic number.

231321043 is a deficient number, since it is larger than the sum of its proper divisors (1).

231321043 is an equidigital number, since it uses as much as digits as its factorization.

231321043 is an odious number, because the sum of its binary digits is odd.

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

The square root of 231321043 is about 15209.2420258210. The cubic root of 231321043 is about 613.8633624873.

Adding to 231321043 its reverse (340123132), we get a palindrome (571444175).

The spelling of 231321043 in words is "two hundred thirty-one million, three hundred twenty-one thousand, forty-three".