990099121 has 8 divisors (see below), whose sum is σ = 1117353600. Its totient is φ = 869052240.

The previous prime is 990099059. The next prime is 990099127. The reversal of 990099121 is 121990099.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 990099121 - 2⁹ = 990098609 is a prime.

It is not an unprimeable number, because it can be changed into a prime (990099127) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1551561 + ... + 1552198.

It is an arithmetic number, because the mean of its divisors is an integer number (139669200).

Almost surely, 2^990099121 is an apocalyptic number.

It is an amenable number.

990099121 is a deficient number, since it is larger than the sum of its proper divisors (127254479).

990099121 is a wasteful number, since it uses less digits than its factorization.

990099121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3103799.

The product of its (nonzero) digits is 13122, while the sum is 40.

The square root of 990099121 is about 31465.8405417685. The cubic root of 990099121 is about 996.6887547568.

The spelling of 990099121 in words is "nine hundred ninety million, ninety-nine thousand, one hundred twenty-one".