243120443057 has 2 divisors, whose sum is σ = 243120443058. Its totient is φ = 243120443056.

The previous prime is 243120443021. The next prime is 243120443089. The reversal of 243120443057 is 750344021342.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 200833044736 + 42287398321 = 448144^2 + 205639^2 .

It is a cyclic number.

It is not a de Polignac number, because 243120443057 - 2¹⁸ = 243120180913 is a prime.

It is not a weakly prime, because it can be changed into another prime (243120443017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121560221528 + 121560221529.

It is an arithmetic number, because the mean of its divisors is an integer number (121560221529).

Almost surely, 2^243120443057 is an apocalyptic number.

It is an amenable number.

243120443057 is a deficient number, since it is larger than the sum of its proper divisors (1).

243120443057 is an equidigital number, since it uses as much as digits as its factorization.

243120443057 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 80640, while the sum is 35.

Adding to 243120443057 its reverse (750344021342), we get a palindrome (993464464399).

The spelling of 243120443057 in words is "two hundred forty-three billion, one hundred twenty million, four hundred forty-three thousand, fifty-seven".