243440311157 has 2 divisors, whose sum is σ = 243440311158. Its totient is φ = 243440311156.

The previous prime is 243440311139. The next prime is 243440311243. The reversal of 243440311157 is 751113044342.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 122192892721 + 121247418436 = 349561^2 + 348206^2 .

It is a cyclic number.

It is not a de Polignac number, because 243440311157 - 2¹⁰ = 243440310133 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (243440311057) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121720155578 + 121720155579.

It is an arithmetic number, because the mean of its divisors is an integer number (121720155579).

Almost surely, 2^243440311157 is an apocalyptic number.

It is an amenable number.

243440311157 is a deficient number, since it is larger than the sum of its proper divisors (1).

243440311157 is an equidigital number, since it uses as much as digits as its factorization.

243440311157 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 40320, while the sum is 35.

Adding to 243440311157 its reverse (751113044342), we get a palindrome (994553355499).

The spelling of 243440311157 in words is "two hundred forty-three billion, four hundred forty million, three hundred eleven thousand, one hundred fifty-seven".