243423321305 has 4 divisors (see below), whose sum is σ = 292107985572. Its totient is φ = 194738657040.

The previous prime is 243423321301. The next prime is 243423321319. The reversal of 243423321305 is 503123324342.

243423321305 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 503123324342 = 2 ⋅251561662171.

It can be written as a sum of positive squares in 2 ways, for example, as 99773225161 + 143650096144 = 315869^2 + 379012^2 .

It is not a de Polignac number, because 243423321305 - 2² = 243423321301 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (243423321301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24342332126 + ... + 24342332135.

It is an arithmetic number, because the mean of its divisors is an integer number (73026996393).

Almost surely, 2^243423321305 is an apocalyptic number.

It is an amenable number.

243423321305 is a deficient number, since it is larger than the sum of its proper divisors (48684664267).

243423321305 is an equidigital number, since it uses as much as digits as its factorization.

243423321305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48684664266.

The product of its (nonzero) digits is 51840, while the sum is 32.

Adding to 243423321305 its reverse (503123324342), we get a palindrome (746546645647).

The spelling of 243423321305 in words is "two hundred forty-three billion, four hundred twenty-three million, three hundred twenty-one thousand, three hundred five".