999890099009 has 2 divisors, whose sum is σ = 999890099010. Its totient is φ = 999890099008.

The previous prime is 999890098993. The next prime is 999890099081. The reversal of 999890099009 is 900990098999.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 794064556609 + 205825542400 = 891103^2 + 453680^2 .

It is a cyclic number.

It is not a de Polignac number, because 999890099009 - 2⁴ = 999890098993 is a prime.

It is not a weakly prime, because it can be changed into another prime (999890099099) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499945049504 + 499945049505.

It is an arithmetic number, because the mean of its divisors is an integer number (499945049505).

Almost surely, 2^999890099009 is an apocalyptic number.

It is an amenable number.

999890099009 is a deficient number, since it is larger than the sum of its proper divisors (1).

999890099009 is an equidigital number, since it uses as much as digits as its factorization.

999890099009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 38263752, while the sum is 71.

The spelling of 999890099009 in words is "nine hundred ninety-nine billion, eight hundred ninety million, ninety-nine thousand, nine".