990010011001001 has 2 divisors, whose sum is σ = 990010011001002. Its totient is φ = 990010011001000.

The previous prime is 990010011000979. The next prime is 990010011001021. The reversal of 990010011001001 is 100100110010099.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 876759443295376 + 113250567705625 = 29610124^2 + 10641925^2 .

It is an emirp because it is prime and its reverse (100100110010099) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-990010011001001 is a prime.

It is not a weakly prime, because it can be changed into another prime (990010011001021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 495005005500500 + 495005005500501.

It is an arithmetic number, because the mean of its divisors is an integer number (495005005500501).

Almost surely, 2^{990010011001001} is an apocalyptic number.

It is an amenable number.

990010011001001 is a deficient number, since it is larger than the sum of its proper divisors (1).

990010011001001 is an equidigital number, since it uses as much as digits as its factorization.

990010011001001 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 81, while the sum is 23.

The spelling of 990010011001001 in words is "nine hundred ninety trillion, ten billion, eleven million, one thousand, one".