11111001001111 has 16 divisors (see below), whose sum is σ = 12843813139488. Its totient is φ = 9499541990400.

The previous prime is 11111001001021. The next prime is 11111001001229. The reversal of 11111001001111 is 11110010011111.

It is a happy number.

11111001001111 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 11111001001111 - 2¹⁵ = 11111000968343 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 (11111001011111) 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, 22242420 + ... + 22736473.

It is an arithmetic number, because the mean of its divisors is an integer number (802738321218).

Almost surely, 2^{11111001001111} is an apocalyptic number.

11111001001111 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

11111001001111 is a deficient number, since it is larger than the sum of its proper divisors (1732812138377).

11111001001111 is a wasteful number, since it uses less digits than its factorization.

11111001001111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44980242.

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

Adding to 11111001001111 its reverse (11110010011111), we get a palindrome (22221011012222).

The spelling of 11111001001111 in words is "eleven trillion, one hundred eleven billion, one million, one thousand, one hundred eleven".