9090990909 has 128 divisors (see below), whose sum is σ = 18573864960. Its totient is φ = 4241030400.

The previous prime is 9090990893. The next prime is 9090990929.

9090990909 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 9090990909 - 2⁴ = 9090990893 is a prime.

It is a super-2 number, since 2×9090990909² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9090990929) 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 in 127 ways as a sum of consecutive naturals, for example, 995454 + ... + 1004544.

It is an arithmetic number, because the mean of its divisors is an integer number (145108320).

Almost surely, 2^9090990909 is an apocalyptic number.

9090990909 is a gapful number since it is divisible by the number (99) formed by its first and last digit.

It is an amenable number.

9090990909 is an abundant number, since it is smaller than the sum of its proper divisors (9482874051).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

9090990909 is a wasteful number, since it uses less digits than its factorization.

9090990909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9168 (or 9162 counting only the distinct ones).

The product of its (nonzero) digits is 531441, while the sum is 54.

The square root of 9090990909 is about 95346.6879812823. The cubic root of 9090990909 is about 2087.0702835896.

It can be divided in two parts, 9090 and 990909, that added together give a palindrome (999999).

The spelling of 9090990909 in words is "nine billion, ninety million, nine hundred ninety thousand, nine hundred nine".