243781876769 has 2 divisors, whose sum is σ = 243781876770. Its totient is φ = 243781876768.

The previous prime is 243781876763. The next prime is 243781876813. The reversal of 243781876769 is 967678187342.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 236475046369 + 7306830400 = 486287^2 + 85480^2 .

It is a cyclic number.

It is not a de Polignac number, because 243781876769 - 2²⁸ = 243513441313 is a prime.

It is a super-2 number, since 2×243781876769² (a number of 24 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 243781876699 and 243781876708.

It is not a weakly prime, because it can be changed into another prime (243781876763) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121890938384 + 121890938385.

It is an arithmetic number, because the mean of its divisors is an integer number (121890938385).

Almost surely, 2^243781876769 is an apocalyptic number.

It is an amenable number.

243781876769 is a deficient number, since it is larger than the sum of its proper divisors (1).

243781876769 is an equidigital number, since it uses as much as digits as its factorization.

243781876769 is an evil number, because the sum of its binary digits is even.

The product of its digits is 170698752, while the sum is 68.

The spelling of 243781876769 in words is "two hundred forty-three billion, seven hundred eighty-one million, eight hundred seventy-six thousand, seven hundred sixty-nine".