99888809 has 2 divisors, whose sum is σ = 99888810. Its totient is φ = 99888808.

The previous prime is 99888791. The next prime is 99888827. The reversal of 99888809 is 90888899.

It is a balanced prime because it is at equal distance from previous prime (99888791) and next prime (99888827).

It can be written as a sum of positive squares in only one way, i.e., 91623184 + 8265625 = 9572^2 + 2875^2 .

It is an emirp because it is prime and its reverse (90888899) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 99888809 - 2²⁰ = 98840233 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (99888869) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49944404 + 49944405.

It is an arithmetic number, because the mean of its divisors is an integer number (49944405).

Almost surely, 2^99888809 is an apocalyptic number.

It is an amenable number.

99888809 is a deficient number, since it is larger than the sum of its proper divisors (1).

99888809 is an equidigital number, since it uses as much as digits as its factorization.

99888809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2985984, while the sum is 59.

The square root of 99888809 is about 9994.4389037104. The cubic root of 99888809 is about 463.9867852583.

The spelling of 99888809 in words is "ninety-nine million, eight hundred eighty-eight thousand, eight hundred nine".