11001001001 has 4 divisors (see below), whose sum is σ = 11001362004. Its totient is φ = 11000640000.

The previous prime is 11001000953. The next prime is 11001001003. The reversal of 11001001001 is 10010010011.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 10010010011 = 29 ⋅345172759.

It can be written as a sum of positive squares in 2 ways, for example, as 1065696025 + 9935304976 = 32645^2 + 99676^2 .

It is a cyclic number.

It is not a de Polignac number, because 11001001001 - 2²² = 10996806697 is a prime.

It is a Duffinian number.

11001001001 is a modest number, since divided by 1001001 gives 11 as remainder.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (11001001003) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 130100 + ... + 197301.

It is an arithmetic number, because the mean of its divisors is an integer number (2750340501).

Almost surely, 2^11001001001 is an apocalyptic number.

It is an amenable number.

11001001001 is a deficient number, since it is larger than the sum of its proper divisors (361003).

11001001001 is an equidigital number, since it uses as much as digits as its factorization.

11001001001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 361002.

The product of its (nonzero) digits is 1, while the sum is 5.

Adding to 11001001001 its reverse (10010010011), we get a palindrome (21011011012).

The spelling of 11001001001 in words is "eleven billion, one million, one thousand, one".