1001111101091 has 4 divisors (see below), whose sum is σ = 1001262355800. Its totient is φ = 1000959846384.

The previous prime is 1001111101087. The next prime is 1001111101121. The reversal of 1001111101091 is 1901011111001.

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 1001111101091 - 2² = 1001111101087 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1001111101061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 75617426 + ... + 75630663.

It is an arithmetic number, because the mean of its divisors is an integer number (250315588950).

Almost surely, 2^{1001111101091} is an apocalyptic number.

1001111101091 is a deficient number, since it is larger than the sum of its proper divisors (151254709).

1001111101091 is an equidigital number, since it uses as much as digits as its factorization.

1001111101091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 151254708.

The product of its (nonzero) digits is 9, while the sum is 17.

Adding to 1001111101091 its reverse (1901011111001), we get a palindrome (2902122212092).

The spelling of 1001111101091 in words is "one trillion, one billion, one hundred eleven million, one hundred one thousand, ninety-one".