2011100111 has 4 divisors (see below), whose sum is σ = 2012647224. Its totient is φ = 2009553000.

The previous prime is 2011100093. The next prime is 2011100167. The reversal of 2011100111 is 1110011102.

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-2011100111 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 (2011100171) 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, 771605 + ... + 774206.

It is an arithmetic number, because the mean of its divisors is an integer number (503161806).

Almost surely, 2^2011100111 is an apocalyptic number.

2011100111 is a deficient number, since it is larger than the sum of its proper divisors (1547113).

2011100111 is a wasteful number, since it uses less digits than its factorization.

2011100111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1547112.

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

The square root of 2011100111 is about 44845.2908453050. The cubic root of 2011100111 is about 1262.2476282267.

Adding to 2011100111 its reverse (1110011102), we get a palindrome (3121111213).

The spelling of 2011100111 in words is "two billion, eleven million, one hundred thousand, one hundred eleven".