2001100111 has 4 divisors (see below), whose sum is σ = 2002987224. Its totient is φ = 1999213000.

The previous prime is 2001100103. The next prime is 2001100151. The reversal of 2001100111 is 1110011002.

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

It is a cyclic number.

It is not a de Polignac number, because 2001100111 - 2³ = 2001100103 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2001100094 and 2001100103.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2001100151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 941965 + ... + 944086.

It is an arithmetic number, because the mean of its divisors is an integer number (500746806).

Almost surely, 2^2001100111 is an apocalyptic number.

2001100111 is a deficient number, since it is larger than the sum of its proper divisors (1887113).

2001100111 is a wasteful number, since it uses less digits than its factorization.

2001100111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1887112.

The product of its (nonzero) digits is 2, while the sum is 7.

The square root of 2001100111 is about 44733.6574739871. The cubic root of 2001100111 is about 1260.1520163863.

Adding to 2001100111 its reverse (1110011002), we get a palindrome (3111111113).

The spelling of 2001100111 in words is "two billion, one million, one hundred thousand, one hundred eleven".