2011001 has 4 divisors (see below), whose sum is σ = 2075904. Its totient is φ = 1946100.

The previous prime is 2010977. The next prime is 2011003. The reversal of 2011001 is 1001102.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2011001 - 2¹⁰ = 2009977 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2011003) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32405 + ... + 32466.

It is an arithmetic number, because the mean of its divisors is an integer number (518976).

2^2011001 is an apocalyptic number.

It is an amenable number.

2011001 is a deficient number, since it is larger than the sum of its proper divisors (64903).

2011001 is an equidigital number, since it uses as much as digits as its factorization.

2011001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64902.

The product of its (nonzero) digits is 2, while the sum is 5.

The square root of 2011001 is about 1418.0976694149. The cubic root of 2011001 is about 126.2226892531. Note that the first 3 decimals are identical.

Adding to 2011001 its reverse (1001102), we get a palindrome (3012103).

Multiplying 2011001 by its reverse (1001102), we get a palindrome (2013217123102).

The spelling of 2011001 in words is "two million, eleven thousand, one".