243781876813 has 2 divisors, whose sum is σ = 243781876814. Its totient is φ = 243781876812.

The previous prime is 243781876769. The next prime is 243781876823. The reversal of 243781876813 is 318678187342.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 232928821129 + 10853055684 = 482627^2 + 104178^2 .

It is a cyclic number.

It is not a de Polignac number, because 243781876813 - 2⁹ = 243781876301 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (243781876823) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121890938406 + 121890938407.

It is an arithmetic number, because the mean of its divisors is an integer number (121890938407).

Almost surely, 2^243781876813 is an apocalyptic number.

It is an amenable number.

243781876813 is a deficient number, since it is larger than the sum of its proper divisors (1).

243781876813 is an equidigital number, since it uses as much as digits as its factorization.

243781876813 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10838016, while the sum is 58.

The spelling of 243781876813 in words is "two hundred forty-three billion, seven hundred eighty-one million, eight hundred seventy-six thousand, eight hundred thirteen".