990109001 has 16 divisors (see below), whose sum is σ = 1155508224. Its totient is φ = 830870784.

The previous prime is 990108997. The next prime is 990109007. The reversal of 990109001 is 100901099.

It is a cyclic number.

It is not a de Polignac number, because 990109001 - 2² = 990108997 is a prime.

It is a super-4 number, since 4×990109001⁴ (a number of 37 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (990109007) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 62936 + ... + 77078.

It is an arithmetic number, because the mean of its divisors is an integer number (72219264).

Almost surely, 2^990109001 is an apocalyptic number.

It is an amenable number.

990109001 is a deficient number, since it is larger than the sum of its proper divisors (165399223).

990109001 is a wasteful number, since it uses less digits than its factorization.

990109001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14360.

The product of its (nonzero) digits is 729, while the sum is 29.

The square root of 990109001 is about 31465.9975370240. The cubic root of 990109001 is about 996.6920699980.

The spelling of 990109001 in words is "nine hundred ninety million, one hundred nine thousand, one".