1000001109991 has 8 divisors (see below), whose sum is σ = 1082874132704. Its totient is φ = 917978067360.

The previous prime is 1000001109979. The next prime is 1000001110027. The reversal of 1000001109991 is 1999011000001.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1000001109991 - 2²³ = 999992721383 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1000001109971) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 212492571 + ... + 212497276.

It is an arithmetic number, because the mean of its divisors is an integer number (135359266588).

Almost surely, 2^{1000001109991} is an apocalyptic number.

1000001109991 is a deficient number, since it is larger than the sum of its proper divisors (82873022713).

1000001109991 is a wasteful number, since it uses less digits than its factorization.

1000001109991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 424990041.

The product of its (nonzero) digits is 729, while the sum is 31.

Adding to 1000001109991 its reverse (1999011000001), we get a palindrome (2999012109992).

The spelling of 1000001109991 in words is "one trillion, one million, one hundred nine thousand, nine hundred ninety-one".