9090991009 has 16 divisors (see below), whose sum is σ = 10150142400. Its totient is φ = 8091684864.

The previous prime is 9090991003. The next prime is 9090991061. The reversal of 9090991009 is 9001990909.

9090991009 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 9090991009 - 2⁹ = 9090990497 is a prime.

It is a super-2 number, since 2×9090991009² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 9090991009.

It is not an unprimeable number, because it can be changed into a prime (9090991003) 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 in 15 ways as a sum of consecutive naturals, for example, 161982 + ... + 210760.

It is an arithmetic number, because the mean of its divisors is an integer number (634383900).

Almost surely, 2^9090991009 is an apocalyptic number.

It is an amenable number.

9090991009 is a deficient number, since it is larger than the sum of its proper divisors (1059151391).

9090991009 is a wasteful number, since it uses less digits than its factorization.

9090991009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49392.

The product of its (nonzero) digits is 59049, while the sum is 46.

The square root of 9090991009 is about 95346.6885056843. The cubic root of 9090991009 is about 2087.0702912421.

The spelling of 9090991009 in words is "nine billion, ninety million, nine hundred ninety-one thousand, nine".