9909099901 has 2 divisors, whose sum is σ = 9909099902. Its totient is φ = 9909099900.

The previous prime is 9909099899. The next prime is 9909099919. The reversal of 9909099901 is 1099909099.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8925336676 + 983763225 = 94474^2 + 31365^2 .

It is an emirp because it is prime and its reverse (1099909099) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 9909099901 - 2¹ = 9909099899 is a prime.

Together with 9909099899, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9909099301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4954549950 + 4954549951.

It is an arithmetic number, because the mean of its divisors is an integer number (4954549951).

Almost surely, 2^9909099901 is an apocalyptic number.

It is an amenable number.

9909099901 is a deficient number, since it is larger than the sum of its proper divisors (1).

9909099901 is an equidigital number, since it uses as much as digits as its factorization.

9909099901 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 531441, while the sum is 55.

The square root of 9909099901 is about 99544.4619303354. The cubic root of 9909099901 is about 2147.8868656220.

The spelling of 9909099901 in words is "nine billion, nine hundred nine million, ninety-nine thousand, nine hundred one".