1100001001 has 16 divisors (see below), whose sum is σ = 1244563200.
Its totient is φ = 963043200.
The previous prime is 1100000959. The next prime is 1100001037. The reversal of 1100001001 is 1001000011.
Adding to 1100001001 its reverse (1001000011), we get a palindrome (2101001012).
It is a cyclic number.
It is not a de Polignac number, because 1100001001 - 229 = 563130089 is a prime.
It is a Duffinian number.
It is not an unprimeable number, because it can be changed into a prime (1100001041) 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, 126256 + ... + 134686.
It is an arithmetic number, because the mean of its divisors is an integer number (77785200).
Almost surely, 21100001001 is an apocalyptic number.
1100001001 is a gapful number since it is divisible by the number (11) formed by its first and last digit.
It is an amenable number.
1100001001 is a deficient number, since it is larger than the sum of its proper divisors (144562199).
1100001001 is a wasteful number, since it uses less digits than its factorization.
1100001001 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 8880.
The product of its (nonzero) digits is 1, while the sum is 4.
The square root of 1100001001 is about 33166.2629941934.
The cubic root of 1100001001 is about 1032.2804285812.
The spelling of 1100001001 in words is "one billion, one hundred million, one thousand, one".