243823406369 has 2 divisors, whose sum is σ = 243823406370. Its totient is φ = 243823406368.

The previous prime is 243823406317. The next prime is 243823406377. The reversal of 243823406369 is 963604328342.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 167723011600 + 76100394769 = 409540^2 + 275863^2 .

It is a cyclic number.

It is not a de Polignac number, because 243823406369 - 2²⁴ = 243806629153 is a prime.

It is a super-2 number, since 2×243823406369² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (243823406069) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121911703184 + 121911703185.

It is an arithmetic number, because the mean of its divisors is an integer number (121911703185).

Almost surely, 2^243823406369 is an apocalyptic number.

It is an amenable number.

243823406369 is a deficient number, since it is larger than the sum of its proper divisors (1).

243823406369 is an equidigital number, since it uses as much as digits as its factorization.

243823406369 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4478976, while the sum is 50.

The spelling of 243823406369 in words is "two hundred forty-three billion, eight hundred twenty-three million, four hundred six thousand, three hundred sixty-nine".