9999988811 has 2 divisors, whose sum is σ = 9999988812.
Its totient is φ = 9999988810.
The previous prime is 9999988807. The next prime is 9999988813. The reversal of 9999988811 is 1188899999.
It is a strong prime.
It is a cyclic number.
It is not a de Polignac number, because 9999988811 - 22 = 9999988807 is a prime.
It is a Sophie Germain prime.
Together with 9999988813, it forms a pair of twin primes.
It is a Chen prime.
It is a nialpdrome in base 10.
It is a zygodrome in base 10.
It is not a weakly prime, because it can be changed into another prime (9999988813) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4999994405 + 4999994406.
It is an arithmetic number, because the mean of its divisors is an integer number (4999994406).
Almost surely, 29999988811 is an apocalyptic number.
9999988811 is a deficient number, since it is larger than the sum of its proper divisors (1).
9999988811 is an equidigital number, since it uses as much as digits as its factorization.
9999988811 is an odious number, because the sum of its binary digits is odd.
The product of its digits is 30233088, while the sum is 71.
The square root of 9999988811 is about 99999.9440549844.
The cubic root of 9999988811 is about 2154.4338864993.
The spelling of 9999988811 in words is "nine billion, nine hundred ninety-nine million, nine hundred eighty-eight thousand, eight hundred eleven".