2011111091 has 32 divisors (see below), whose sum is σ = 2274906816. Its totient is φ = 1762560000.

The previous prime is 2011111079. The next prime is 2011111097. The reversal of 2011111091 is 1901111102.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 2011111091 - 2³⁰ = 937369267 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2011111097) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 11111021 + ... + 11111201.

It is an arithmetic number, because the mean of its divisors is an integer number (71090838).

Almost surely, 2^2011111091 is an apocalyptic number.

2011111091 is a deficient number, since it is larger than the sum of its proper divisors (263795725).

2011111091 is a wasteful number, since it uses less digits than its factorization.

2011111091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 503.

The product of its (nonzero) digits is 18, while the sum is 17.

The square root of 2011111091 is about 44845.4132660186. The cubic root of 2011111091 is about 1262.2499253863.

Adding to 2011111091 its reverse (1901111102), we get a palindrome (3912222193).

It can be divided in two parts, 201111 and 1091, that added together give a palindrome (202202).

The spelling of 2011111091 in words is "two billion, eleven million, one hundred eleven thousand, ninety-one".