9985243517 has 2 divisors, whose sum is σ = 9985243518. Its totient is φ = 9985243516.

The previous prime is 9985243511. The next prime is 9985243549. The reversal of 9985243517 is 7153425899.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8714035801 + 1271207716 = 93349^2 + 35654^2 .

It is a cyclic number.

It is not a de Polignac number, because 9985243517 - 2⁴ = 9985243501 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9985243511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4992621758 + 4992621759.

It is an arithmetic number, because the mean of its divisors is an integer number (4992621759).

Almost surely, 2^9985243517 is an apocalyptic number.

It is an amenable number.

9985243517 is a deficient number, since it is larger than the sum of its proper divisors (1).

9985243517 is an equidigital number, since it uses as much as digits as its factorization.

9985243517 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2721600, while the sum is 53.

The square root of 9985243517 is about 99926.1903456746. The cubic root of 9985243517 is about 2153.3744390456.

The spelling of 9985243517 in words is "nine billion, nine hundred eighty-five million, two hundred forty-three thousand, five hundred seventeen".