243113221157 has 2 divisors, whose sum is σ = 243113221158. Its totient is φ = 243113221156.

The previous prime is 243113221069. The next prime is 243113221181. The reversal of 243113221157 is 751122311342.

243113221157 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 230168698081 + 12944523076 = 479759^2 + 113774^2 .

It is a cyclic number.

It is not a de Polignac number, because 243113221157 - 2¹⁴ = 243113204773 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (243113221187) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121556610578 + 121556610579.

It is an arithmetic number, because the mean of its divisors is an integer number (121556610579).

Almost surely, 2^243113221157 is an apocalyptic number.

It is an amenable number.

243113221157 is a deficient number, since it is larger than the sum of its proper divisors (1).

243113221157 is an equidigital number, since it uses as much as digits as its factorization.

243113221157 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10080, while the sum is 32.

Adding to 243113221157 its reverse (751122311342), we get a palindrome (994235532499).

The spelling of 243113221157 in words is "two hundred forty-three billion, one hundred thirteen million, two hundred twenty-one thousand, one hundred fifty-seven".