243312163109 has 2 divisors, whose sum is σ = 243312163110. Its totient is φ = 243312163108.

The previous prime is 243312163049. The next prime is 243312163117. The reversal of 243312163109 is 901361213342.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 158799859009 + 84512304100 = 398497^2 + 290710^2 .

It is a cyclic number.

It is not a de Polignac number, because 243312163109 - 2²⁰ = 243311114533 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (243312163909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121656081554 + 121656081555.

It is an arithmetic number, because the mean of its divisors is an integer number (121656081555).

Almost surely, 2^243312163109 is an apocalyptic number.

It is an amenable number.

243312163109 is a deficient number, since it is larger than the sum of its proper divisors (1).

243312163109 is an equidigital number, since it uses as much as digits as its factorization.

243312163109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23328, while the sum is 35.

The spelling of 243312163109 in words is "two hundred forty-three billion, three hundred twelve million, one hundred sixty-three thousand, one hundred nine".