990101001 has 16 divisors (see below), whose sum is σ = 1396831040. Its totient is φ = 622080000.

The previous prime is 990100997. The next prime is 990101027. The reversal of 990101001 is 100101099.

990101001 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 990101001 - 2² = 990100997 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (990101071) 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, 34000 + ... + 56001.

It is an arithmetic number, because the mean of its divisors is an integer number (87301940).

Almost surely, 2^990101001 is an apocalyptic number.

It is an amenable number.

990101001 is a deficient number, since it is larger than the sum of its proper divisors (406730039).

990101001 is a wasteful number, since it uses less digits than its factorization.

990101001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90216.

The product of its (nonzero) digits is 81, while the sum is 21.

The square root of 990101001 is about 31465.8704154199. The cubic root of 990101001 is about 996.6893855939.

The spelling of 990101001 in words is "nine hundred ninety million, one hundred one thousand, one".