9999985771 has 2 divisors, whose sum is σ = 9999985772. Its totient is φ = 9999985770.

The previous prime is 9999985759. The next prime is 9999985783. The reversal of 9999985771 is 1775899999.

It is a balanced prime because it is at equal distance from previous prime (9999985759) and next prime (9999985783).

It is a cyclic number.

It is not a de Polignac number, because 9999985771 - 2²³ = 9991597163 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 9999985694 and 9999985703.

It is not a weakly prime, because it can be changed into another prime (9999985711) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4999992885 + 4999992886.

It is an arithmetic number, because the mean of its divisors is an integer number (4999992886).

Almost surely, 2^9999985771 is an apocalyptic number.

9999985771 is a deficient number, since it is larger than the sum of its proper divisors (1).

9999985771 is an equidigital number, since it uses as much as digits as its factorization.

9999985771 is an evil number, because the sum of its binary digits is even.

The product of its digits is 115736040, while the sum is 73.

The square root of 9999985771 is about 99999.9288549747. The cubic root of 9999985771 is about 2154.4336681830.

The spelling of 9999985771 in words is "nine billion, nine hundred ninety-nine million, nine hundred eighty-five thousand, seven hundred seventy-one".