243232320169 has 2 divisors, whose sum is σ = 243232320170. Its totient is φ = 243232320168.

The previous prime is 243232320131. The next prime is 243232320229. The reversal of 243232320169 is 961023232342.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 159472435600 + 83759884569 = 399340^2 + 289413^2 .

It is a cyclic number.

It is not a de Polignac number, because 243232320169 - 2⁹ = 243232319657 is a prime.

It is a super-2 number, since 2×243232320169² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (243232320269) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121616160084 + 121616160085.

It is an arithmetic number, because the mean of its divisors is an integer number (121616160085).

Almost surely, 2^243232320169 is an apocalyptic number.

It is an amenable number.

243232320169 is a deficient number, since it is larger than the sum of its proper divisors (1).

243232320169 is an equidigital number, since it uses as much as digits as its factorization.

243232320169 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 93312, while the sum is 37.

The spelling of 243232320169 in words is "two hundred forty-three billion, two hundred thirty-two million, three hundred twenty thousand, one hundred sixty-nine".