243044020313 has 4 divisors (see below), whose sum is σ = 243050304420. Its totient is φ = 243037736208.

The previous prime is 243044020301. The next prime is 243044020319. The reversal of 243044020313 is 313020440342.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 148615647049 + 94428373264 = 385507^2 + 307292^2 .

It is a cyclic number.

It is not a de Polignac number, because 243044020313 - 2³⁶ = 174324543577 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (243044020319) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3083678 + ... + 3161511.

It is an arithmetic number, because the mean of its divisors is an integer number (60762576105).

Almost surely, 2^243044020313 is an apocalyptic number.

It is an amenable number.

243044020313 is a deficient number, since it is larger than the sum of its proper divisors (6284107).

243044020313 is an equidigital number, since it uses as much as digits as its factorization.

243044020313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6284106.

The product of its (nonzero) digits is 6912, while the sum is 26.

Adding to 243044020313 its reverse (313020440342), we get a palindrome (556064460655).

The spelling of 243044020313 in words is "two hundred forty-three billion, forty-four million, twenty thousand, three hundred thirteen".