243385957417 has 2 divisors, whose sum is σ = 243385957418. Its totient is φ = 243385957416.

The previous prime is 243385957379. The next prime is 243385957447. The reversal of 243385957417 is 714759583342.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 151510891536 + 91875065881 = 389244^2 + 303109^2 .

It is a cyclic number.

It is not a de Polignac number, because 243385957417 - 2¹⁹ = 243385433129 is a prime.

It is not a weakly prime, because it can be changed into another prime (243385957447) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121692978708 + 121692978709.

It is an arithmetic number, because the mean of its divisors is an integer number (121692978709).

Almost surely, 2^243385957417 is an apocalyptic number.

It is an amenable number.

243385957417 is a deficient number, since it is larger than the sum of its proper divisors (1).

243385957417 is an equidigital number, since it uses as much as digits as its factorization.

243385957417 is an evil number, because the sum of its binary digits is even.

The product of its digits is 25401600, while the sum is 58.

The spelling of 243385957417 in words is "two hundred forty-three billion, three hundred eighty-five million, nine hundred fifty-seven thousand, four hundred seventeen".