243403741813 has 2 divisors, whose sum is σ = 243403741814. Its totient is φ = 243403741812.

The previous prime is 243403741811. The next prime is 243403741829. The reversal of 243403741813 is 318147304342.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 131792959089 + 111610782724 = 363033^2 + 334082^2 .

It is a cyclic number.

It is not a de Polignac number, because 243403741813 - 2¹ = 243403741811 is a prime.

Together with 243403741811, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (243403741811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121701870906 + 121701870907.

It is an arithmetic number, because the mean of its divisors is an integer number (121701870907).

Almost surely, 2^243403741813 is an apocalyptic number.

It is an amenable number.

243403741813 is a deficient number, since it is larger than the sum of its proper divisors (1).

243403741813 is an equidigital number, since it uses as much as digits as its factorization.

243403741813 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 193536, while the sum is 40.

The spelling of 243403741813 in words is "two hundred forty-three billion, four hundred three million, seven hundred forty-one thousand, eight hundred thirteen".