243219948161 has 2 divisors, whose sum is σ = 243219948162. Its totient is φ = 243219948160.

The previous prime is 243219948133. The next prime is 243219948163. The reversal of 243219948161 is 161849912342.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 229207307536 + 14012640625 = 478756^2 + 118375^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-243219948161 is a prime.

Together with 243219948163, 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 (243219948163) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121609974080 + 121609974081.

It is an arithmetic number, because the mean of its divisors is an integer number (121609974081).

Almost surely, 2^243219948161 is an apocalyptic number.

It is an amenable number.

243219948161 is a deficient number, since it is larger than the sum of its proper divisors (1).

243219948161 is an equidigital number, since it uses as much as digits as its factorization.

243219948161 is an evil number, because the sum of its binary digits is even.

The product of its digits is 746496, while the sum is 50.

The spelling of 243219948161 in words is "two hundred forty-three billion, two hundred nineteen million, nine hundred forty-eight thousand, one hundred sixty-one".