1000111009991 has 2 divisors, whose sum is σ = 1000111009992. Its totient is φ = 1000111009990.

The previous prime is 1000111009969. The next prime is 1000111010033. The reversal of 1000111009991 is 1999001110001.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1000111009991 - 2³⁸ = 725233103047 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1000111009091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 500055504995 + 500055504996.

It is an arithmetic number, because the mean of its divisors is an integer number (500055504996).

Almost surely, 2^{1000111009991} is an apocalyptic number.

1000111009991 is a deficient number, since it is larger than the sum of its proper divisors (1).

1000111009991 is an equidigital number, since it uses as much as digits as its factorization.

1000111009991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 729, while the sum is 32.

Adding to 1000111009991 its reverse (1999001110001), we get a palindrome (2999112119992).

The spelling of 1000111009991 in words is "one trillion, one hundred eleven million, nine thousand, nine hundred ninety-one".