243040331 has 2 divisors, whose sum is σ = 243040332. Its totient is φ = 243040330.

The previous prime is 243040327. The next prime is 243040361. The reversal of 243040331 is 133040342.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 243040331 - 2² = 243040327 is a prime.

It is a super-2 number, since 2×243040331² = 118137204985179122, which contains 22 as substring.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (243040321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121520165 + 121520166.

It is an arithmetic number, because the mean of its divisors is an integer number (121520166).

Almost surely, 2^243040331 is an apocalyptic number.

243040331 is a deficient number, since it is larger than the sum of its proper divisors (1).

243040331 is an equidigital number, since it uses as much as digits as its factorization.

243040331 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 864, while the sum is 20.

The square root of 243040331 is about 15589.7508318767. The cubic root of 243040331 is about 624.0596684052.

Adding to 243040331 its reverse (133040342), we get a palindrome (376080673).

The spelling of 243040331 in words is "two hundred forty-three million, forty thousand, three hundred thirty-one".