2001011111 has 8 divisors (see below), whose sum is σ = 2200111104. Its totient is φ = 1804776120.

The previous prime is 2001011101. The next prime is 2001011123. The reversal of 2001011111 is 1111101002.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 2001011111 - 2¹⁰ = 2001010087 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2001011101) 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, 714785 + ... + 717578.

It is an arithmetic number, because the mean of its divisors is an integer number (275013888).

Almost surely, 2^2001011111 is an apocalyptic number.

2001011111 is a deficient number, since it is larger than the sum of its proper divisors (199099993).

2001011111 is a wasteful number, since it uses less digits than its factorization.

2001011111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1432501.

The product of its (nonzero) digits is 2, while the sum is 8.

The square root of 2001011111 is about 44732.6626862296. The cubic root of 2001011111 is about 1260.1333341305.

Adding to 2001011111 its reverse (1111101002), we get a palindrome (3112112113).

The spelling of 2001011111 in words is "two billion, one million, eleven thousand, one hundred eleven".