990109901 has 8 divisors (see below), whose sum is σ = 1080347808. Its totient is φ = 899910000.

The previous prime is 990109891. The next prime is 990109933. The reversal of 990109901 is 109901099.

It is a happy number.

990109901 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a de Polignac number, because none of the positive numbers 2^k-990109901 is a prime.

It is a super-3 number, since 3×990109901³ (a number of 28 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (990109301) 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, 95051 + ... + 104951.

It is an arithmetic number, because the mean of its divisors is an integer number (135043476).

Almost surely, 2^990109901 is an apocalyptic number.

It is an amenable number.

990109901 is a deficient number, since it is larger than the sum of its proper divisors (90237907).

990109901 is a wasteful number, since it uses less digits than its factorization.

990109901 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19003.

The product of its (nonzero) digits is 6561, while the sum is 38.

The square root of 990109901 is about 31466.0118381723. The cubic root of 990109901 is about 996.6923719926.

The spelling of 990109901 in words is "nine hundred ninety million, one hundred nine thousand, nine hundred one".