243121544273 has 2 divisors, whose sum is σ = 243121544274. Its totient is φ = 243121544272.

The previous prime is 243121544261. The next prime is 243121544299. The reversal of 243121544273 is 372445121342.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 180925174609 + 62196369664 = 425353^2 + 249392^2 .

It is a cyclic number.

It is not a de Polignac number, because 243121544273 - 2¹⁴ = 243121527889 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (243121594273) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121560772136 + 121560772137.

It is an arithmetic number, because the mean of its divisors is an integer number (121560772137).

Almost surely, 2^243121544273 is an apocalyptic number.

It is an amenable number.

243121544273 is a deficient number, since it is larger than the sum of its proper divisors (1).

243121544273 is an equidigital number, since it uses as much as digits as its factorization.

243121544273 is an evil number, because the sum of its binary digits is even.

The product of its digits is 161280, while the sum is 38.

The spelling of 243121544273 in words is "two hundred forty-three billion, one hundred twenty-one million, five hundred forty-four thousand, two hundred seventy-three".