999989801 has 2 divisors, whose sum is σ = 999989802. Its totient is φ = 999989800.

The previous prime is 999989797. The next prime is 999989857. The reversal of 999989801 is 108989999.

999989801 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 677248576 + 322741225 = 26024^2 + 17965^2 .

It is an emirp because it is prime and its reverse (108989999) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 999989801 - 2² = 999989797 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (999989201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499994900 + 499994901.

It is an arithmetic number, because the mean of its divisors is an integer number (499994901).

Almost surely, 2^999989801 is an apocalyptic number.

It is an amenable number.

999989801 is a deficient number, since it is larger than the sum of its proper divisors (1).

999989801 is an equidigital number, since it uses as much as digits as its factorization.

999989801 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3779136, while the sum is 62.

The square root of 999989801 is about 31622.6153409233. The cubic root of 999989801 is about 999.9966003218.

The spelling of 999989801 in words is "nine hundred ninety-nine million, nine hundred eighty-nine thousand, eight hundred one".