243122045557 has 2 divisors, whose sum is σ = 243122045558. Its totient is φ = 243122045556.

The previous prime is 243122045533. The next prime is 243122045609. The reversal of 243122045557 is 755540221342.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 195639020721 + 47483024836 = 442311^2 + 217906^2 .

It is a cyclic number.

It is not a de Polignac number, because 243122045557 - 2³¹ = 240974561909 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (243122015557) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121561022778 + 121561022779.

It is an arithmetic number, because the mean of its divisors is an integer number (121561022779).

Almost surely, 2^243122045557 is an apocalyptic number.

It is an amenable number.

243122045557 is a deficient number, since it is larger than the sum of its proper divisors (1).

243122045557 is an equidigital number, since it uses as much as digits as its factorization.

243122045557 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 336000, while the sum is 40.

Adding to 243122045557 its reverse (755540221342), we get a palindrome (998662266899).

The spelling of 243122045557 in words is "two hundred forty-three billion, one hundred twenty-two million, forty-five thousand, five hundred fifty-seven".