1000001110991 has 2 divisors, whose sum is σ = 1000001110992. Its totient is φ = 1000001110990.

The previous prime is 1000001110987. The next prime is 1000001111033. The reversal of 1000001110991 is 1990111000001.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (1990111000001) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1000001110991 - 2² = 1000001110987 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1000001110931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 500000555495 + 500000555496.

It is an arithmetic number, because the mean of its divisors is an integer number (500000555496).

Almost surely, 2^{1000001110991} is an apocalyptic number.

1000001110991 is a deficient number, since it is larger than the sum of its proper divisors (1).

1000001110991 is an equidigital number, since it uses as much as digits as its factorization.

1000001110991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 81, while the sum is 23.

Adding to 1000001110991 its reverse (1990111000001), we get a palindrome (2990112110992).

The spelling of 1000001110991 in words is "one trillion, one million, one hundred ten thousand, nine hundred ninety-one".