9999888719 has 2 divisors, whose sum is σ = 9999888720. Its totient is φ = 9999888718.

The previous prime is 9999888677. The next prime is 9999888751. The reversal of 9999888719 is 9178889999.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 9999888719 - 2⁸ = 9999888463 is a prime.

It is a super-2 number, since 2×9999888719² (a number of 21 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 9999888719.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9999888419) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4999944359 + 4999944360.

It is an arithmetic number, because the mean of its divisors is an integer number (4999944360).

Almost surely, 2^9999888719 is an apocalyptic number.

9999888719 is a deficient number, since it is larger than the sum of its proper divisors (1).

9999888719 is an equidigital number, since it uses as much as digits as its factorization.

9999888719 is an evil number, because the sum of its binary digits is even.

The product of its digits is 211631616, while the sum is 77.

The square root of 9999888719 is about 99999.4435934521. The cubic root of 9999888719 is about 2154.4266984140.

The spelling of 9999888719 in words is "nine billion, nine hundred ninety-nine million, eight hundred eighty-eight thousand, seven hundred nineteen".