1011001111111 has 4 divisors (see below), whose sum is σ = 1017440608792. Its totient is φ = 1004561613432.

The previous prime is 1011001111069. The next prime is 1011001111129. The reversal of 1011001111111 is 1111111001101.

It is a happy number.

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 1011001111111 - 2⁷ = 1011001110983 is a prime.

It is a Duffinian number.

1011001111111 is a modest number, since divided by 1111111 gives 101100 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1011001111151) 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, 3219748605 + ... + 3219748918.

It is an arithmetic number, because the mean of its divisors is an integer number (254360152198).

Almost surely, 2^{1011001111111} is an apocalyptic number.

1011001111111 is a deficient number, since it is larger than the sum of its proper divisors (6439497681).

1011001111111 is an equidigital number, since it uses as much as digits as its factorization.

1011001111111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6439497680.

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

Adding to 1011001111111 its reverse (1111111001101), we get a palindrome (2122112112212).

The spelling of 1011001111111 in words is "one trillion, eleven billion, one million, one hundred eleven thousand, one hundred eleven".