2001011 has 4 divisors (see below), whose sum is σ = 2004072. Its totient is φ = 1997952.

The previous prime is 2000989. The next prime is 2001037. The reversal of 2001011 is 1101002.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2001011 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2000986 and 2001004.

It is not an unprimeable number, because it can be changed into a prime (2001211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 110 + ... + 2003.

It is an arithmetic number, because the mean of its divisors is an integer number (501018).

2^2001011 is an apocalyptic number.

2001011 is a deficient number, since it is larger than the sum of its proper divisors (3061).

2001011 is an equidigital number, since it uses as much as digits as its factorization.

2001011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3060.

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

The square root of 2001011 is about 1414.5709596906. The cubic root of 2001011 is about 126.0133310830.

Adding to 2001011 its reverse (1101002), we get a palindrome (3102013).

Subtracting from 2001011 its reverse (1101002), we obtain a palindrome (900009).

Multiplying 2001011 by its reverse (1101002), we get a palindrome (2203117113022).

The spelling of 2001011 in words is "two million, one thousand, eleven".