243138443 has 2 divisors, whose sum is σ = 243138444. Its totient is φ = 243138442.

The previous prime is 243138419. The next prime is 243138463. The reversal of 243138443 is 344831342.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 243138443 - 2¹⁴ = 243122059 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (243138463) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121569221 + 121569222.

It is an arithmetic number, because the mean of its divisors is an integer number (121569222).

Almost surely, 2^243138443 is an apocalyptic number.

243138443 is a deficient number, since it is larger than the sum of its proper divisors (1).

243138443 is an equidigital number, since it uses as much as digits as its factorization.

243138443 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 27648, while the sum is 32.

The square root of 243138443 is about 15592.8971971215. The cubic root of 243138443 is about 624.1436318430.

Adding to 243138443 its reverse (344831342), we get a palindrome (587969785).

The spelling of 243138443 in words is "two hundred forty-three million, one hundred thirty-eight thousand, four hundred forty-three".