1111111001111 has 4 divisors (see below), whose sum is σ = 1111148390424. Its totient is φ = 1111073611800.

The previous prime is 1111111001071. The next prime is 1111111001123. The reversal of 1111111001111 is 1111001111111.

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 1111111001111 - 2²⁶ = 1111043892247 is a prime.

It is a Duffinian number.

It is a zygodrome in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 1111111001092 and 1111111001101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1111111001131) 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, 18650045 + ... + 18709526.

It is an arithmetic number, because the mean of its divisors is an integer number (277787097606).

Almost surely, 2^{1111111001111} is an apocalyptic number.

1111111001111 is a deficient number, since it is larger than the sum of its proper divisors (37389313).

1111111001111 is an equidigital number, since it uses as much as digits as its factorization.

1111111001111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37389312.

The product of its (nonzero) digits is 1, while the sum is 11.

Adding to 1111111001111 its reverse (1111001111111), we get a palindrome (2222112112222).

It can be divided in two parts, 111 and 1111001111, that multiplied together give a palindrome (123321123321).

The spelling of 1111111001111 in words is "one trillion, one hundred eleven billion, one hundred eleven million, one thousand, one hundred eleven".