2001001011 has 4 divisors (see below), whose sum is σ = 2668001352. Its totient is φ = 1334000672.

The previous prime is 2001001003. The next prime is 2001001019. The reversal of 2001001011 is 1101001002.

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

It is an interprime number because it is at equal distance from previous prime (2001001003) and next prime (2001001019).

It is a cyclic number.

It is not a de Polignac number, because 2001001011 - 2³ = 2001001003 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2001001019) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 333500166 + ... + 333500171.

It is an arithmetic number, because the mean of its divisors is an integer number (667000338).

Almost surely, 2^2001001011 is an apocalyptic number.

2001001011 is a deficient number, since it is larger than the sum of its proper divisors (667000341).

2001001011 is an equidigital number, since it uses as much as digits as its factorization.

2001001011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 667000340.

The product of its (nonzero) digits is 2, while the sum is 6.

The square root of 2001001011 is about 44732.5497931875. The cubic root of 2001001011 is about 1260.1312139744.

Adding to 2001001011 its reverse (1101001002), we get a palindrome (3102002013).

Subtracting from 2001001011 its reverse (1101001002), we obtain a palindrome (900000009).

The spelling of 2001001011 in words is "two billion, one million, one thousand, eleven".