11001 has 8 divisors (see below), whose sum is σ = 15520. Its totient is φ = 6912.

The previous prime is 10993. The next prime is 11003. The reversal of 11001 is 10011.

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

It is not a de Polignac number, because 11001 - 2³ = 10993 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (3).

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (11003) 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, 40 + ... + 153.

It is an arithmetic number, because the mean of its divisors is an integer number (1940).

2¹¹⁰⁰¹ is an apocalyptic number.

It is an amenable number.

11001 is a deficient number, since it is larger than the sum of its proper divisors (4519).

11001 is a wasteful number, since it uses less digits than its factorization.

11001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 215.

The product of its (nonzero) digits is 1, while the sum is 3.

The square root of 11001 is about 104.8856520216. The cubic root of 11001 is about 22.2404748186.

Adding to 11001 its reverse (10011), we get a palindrome (21012).

Subtracting from 11001 its reverse (10011), we obtain a triangular number (990 = T₄₄).

Multiplying 11001 by its reverse (10011), we get a palindrome (110131011).

The spelling of 11001 in words is "eleven thousand, one", and thus it is an iban number.