243145220369 has 2 divisors, whose sum is σ = 243145220370. Its totient is φ = 243145220368.

The previous prime is 243145220333. The next prime is 243145220371. The reversal of 243145220369 is 963022541342.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 218941639744 + 24203580625 = 467912^2 + 155575^2 .

It is a cyclic number.

It is not a de Polignac number, because 243145220369 - 2⁸ = 243145220113 is a prime.

It is a super-2 number, since 2×243145220369² (a number of 24 digits) contains 22 as substring.

Together with 243145220371, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (243145223369) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121572610184 + 121572610185.

It is an arithmetic number, because the mean of its divisors is an integer number (121572610185).

Almost surely, 2^243145220369 is an apocalyptic number.

It is an amenable number.

243145220369 is a deficient number, since it is larger than the sum of its proper divisors (1).

243145220369 is an equidigital number, since it uses as much as digits as its factorization.

243145220369 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 311040, while the sum is 41.

The spelling of 243145220369 in words is "two hundred forty-three billion, one hundred forty-five million, two hundred twenty thousand, three hundred sixty-nine".