243140424257 has 2 divisors, whose sum is σ = 243140424258. Its totient is φ = 243140424256.

The previous prime is 243140424203. The next prime is 243140424271. The reversal of 243140424257 is 752424041342.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 197228362816 + 45912061441 = 444104^2 + 214271^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-243140424257 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 243140424257.

It is not a weakly prime, because it can be changed into another prime (243140424277) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121570212128 + 121570212129.

It is an arithmetic number, because the mean of its divisors is an integer number (121570212129).

Almost surely, 2^243140424257 is an apocalyptic number.

It is an amenable number.

243140424257 is a deficient number, since it is larger than the sum of its proper divisors (1).

243140424257 is an equidigital number, since it uses as much as digits as its factorization.

243140424257 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 215040, while the sum is 38.

Adding to 243140424257 its reverse (752424041342), we get a palindrome (995564465599).

The spelling of 243140424257 in words is "two hundred forty-three billion, one hundred forty million, four hundred twenty-four thousand, two hundred fifty-seven".