11111011111 has 16 divisors (see below), whose sum is σ = 11538285696. Its totient is φ = 10692000000.

The previous prime is 11111011099. The next prime is 11111011117.

It is a happy number.

11111011111 is nontrivially palindromic in base 10.

It is a cyclic number.

It is not a de Polignac number, because 11111011111 - 2¹⁵ = 11110978343 is a prime.

11111011111 is a strobogrammatic number because it is the same when read upside-down.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11111011117) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1117261 + ... + 1127161.

It is an arithmetic number, because the mean of its divisors is an integer number (721142856).

Almost surely, 2^11111011111 is an apocalyptic number.

11111011111 is a deficient number, since it is larger than the sum of its proper divisors (427274585).

11111011111 is a wasteful number, since it uses less digits than its factorization.

11111011111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10314.

The product of its (nonzero) digits is 1, while the sum is 10.

It can be divided in two parts, 111110 and 11111, that added together give a palindrome (122221).

The spelling of 11111011111 in words is "eleven billion, one hundred eleven million, eleven thousand, one hundred eleven".