243155041361 has 2 divisors, whose sum is σ = 243155041362. Its totient is φ = 243155041360.

The previous prime is 243155041289. The next prime is 243155041379. The reversal of 243155041361 is 163140551342.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 126420069136 + 116734972225 = 355556^2 + 341665^2 .

It is a cyclic number.

It is not a de Polignac number, because 243155041361 - 2¹⁴ = 243155024977 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 (243155041861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121577520680 + 121577520681.

It is an arithmetic number, because the mean of its divisors is an integer number (121577520681).

Almost surely, 2^243155041361 is an apocalyptic number.

It is an amenable number.

243155041361 is a deficient number, since it is larger than the sum of its proper divisors (1).

243155041361 is an equidigital number, since it uses as much as digits as its factorization.

243155041361 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 43200, while the sum is 35.

The spelling of 243155041361 in words is "two hundred forty-three billion, one hundred fifty-five million, forty-one thousand, three hundred sixty-one".