999998801 has 2 divisors, whose sum is σ = 999998802.
Its totient is φ = 999998800.
The previous prime is 999998789. The next prime is 999998843. The reversal of 999998801 is 108899999.
It is a weak prime.
It can be written as a sum of positive squares in only one way, i.e., 965717776 + 34281025 = 31076^2 + 5855^2
It is a cyclic number.
It is not a de Polignac number, because 999998801 - 218 = 999736657 is a prime.
It is a Sophie Germain prime.
It is a Curzon number.
It is not a weakly prime, because it can be changed into another prime (999998501) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499999400 + 499999401.
It is an arithmetic number, because the mean of its divisors is an integer number (499999401).
Almost surely, 2999998801 is an apocalyptic number.
It is an amenable number.
999998801 is a deficient number, since it is larger than the sum of its proper divisors (1).
999998801 is an equidigital number, since it uses as much as digits as its factorization.
999998801 is an evil number, because the sum of its binary digits is even.
The product of its (nonzero) digits is 3779136, while the sum is 62.
The square root of 999998801 is about 31622.7576438235.
The cubic root of 999998801 is about 999.9996003332.
Note that the first 3 decimals are identical.
The spelling of 999998801 in words is "nine hundred ninety-nine million, nine hundred ninety-eight thousand, eight hundred one".