99800009 has 2 divisors, whose sum is σ = 99800010. Its totient is φ = 99800008.

The previous prime is 99799993. The next prime is 99800011. The reversal of 99800009 is 90000899.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 51079609 + 48720400 = 7147^2 + 6980^2 .

It is a cyclic number.

It is not a de Polignac number, because 99800009 - 2⁴ = 99799993 is a prime.

Together with 99800011, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (99800069) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49900004 + 49900005.

It is an arithmetic number, because the mean of its divisors is an integer number (49900005).

Almost surely, 2^99800009 is an apocalyptic number.

It is an amenable number.

99800009 is a deficient number, since it is larger than the sum of its proper divisors (1).

99800009 is an equidigital number, since it uses as much as digits as its factorization.

99800009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5832, while the sum is 35.

The square root of 99800009 is about 9989.9954454444. The cubic root of 99800009 is about 463.8492515267.

The spelling of 99800009 in words is "ninety-nine million, eight hundred thousand, nine".