9919090000 has 50 divisors (see below), whose sum is σ = 24015133010. Its totient is φ = 3967632000.

The previous prime is 9919089997. The next prime is 9919090007. The reversal of 9919090000 is 909199.

It can be written as a sum of positive squares in 5 ways, for example, as 4601180224 + 5317909776 = 67832^2 + 72924^2 .

It is a tau number, because it is divible by the number of its divisors (50).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9919090007) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 485955 + ... + 505954.

Almost surely, 2^9919090000 is an apocalyptic number.

It is an amenable number.

9919090000 is an abundant number, since it is smaller than the sum of its proper divisors (14096043010).

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

9919090000 is an equidigital number, since it uses as much as digits as its factorization.

9919090000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 991937 (or 991916 counting only the distinct ones).

The product of its (nonzero) digits is 6561, while the sum is 37.

The square root of 9919090000 is about 99594.6283692047. The cubic root of 9919090000 is about 2148.6084379033.

Adding to 9919090000 its reverse (909199), we get a palindrome (9919999199).

The spelling of 9919090000 in words is "nine billion, nine hundred nineteen million, ninety thousand".