9999719819 has 2 divisors, whose sum is σ = 9999719820. Its totient is φ = 9999719818.

The previous prime is 9999719801. The next prime is 9999719837. The reversal of 9999719819 is 9189179999.

It is a balanced prime because it is at equal distance from previous prime (9999719801) and next prime (9999719837).

It is a cyclic number.

It is not a de Polignac number, because 9999719819 - 2²⁸ = 9731284363 is a prime.

It is a super-2 number, since 2×9999719819² (a number of 21 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (9999712819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4999859909 + 4999859910.

It is an arithmetic number, because the mean of its divisors is an integer number (4999859910).

Almost surely, 2^9999719819 is an apocalyptic number.

9999719819 is a deficient number, since it is larger than the sum of its proper divisors (1).

9999719819 is an equidigital number, since it uses as much as digits as its factorization.

9999719819 is an evil number, because the sum of its binary digits is even.

The product of its digits is 29760696, while the sum is 71.

The square root of 9999719819 is about 99998.5990851872. The cubic root of 9999719819 is about 2154.4145687884.

The spelling of 9999719819 in words is "nine billion, nine hundred ninety-nine million, seven hundred nineteen thousand, eight hundred nineteen".