9959889517 has 2 divisors, whose sum is σ = 9959889518. Its totient is φ = 9959889516.

The previous prime is 9959889487. The next prime is 9959889523. The reversal of 9959889517 is 7159889599.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8462896036 + 1496993481 = 91994^2 + 38691^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9959889517 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9959889817) 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, 4979944758 + 4979944759.

It is an arithmetic number, because the mean of its divisors is an integer number (4979944759).

Almost surely, 2^9959889517 is an apocalyptic number.

It is an amenable number.

9959889517 is a deficient number, since it is larger than the sum of its proper divisors (1).

9959889517 is an equidigital number, since it uses as much as digits as its factorization.

9959889517 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 73483200, while the sum is 70.

The square root of 9959889517 is about 99799.2460743066. The cubic root of 9959889517 is about 2151.5503162664.

The spelling of 9959889517 in words is "nine billion, nine hundred fifty-nine million, eight hundred eighty-nine thousand, five hundred seventeen".