1000109991 has 8 divisors (see below), whose sum is σ = 1334309104. Its totient is φ = 666325440.

The previous prime is 1000109987. The next prime is 1000109993. The reversal of 1000109991 is 1999010001.

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

It is not a de Polignac number, because 1000109991 - 2² = 1000109987 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1000109993) 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, 97966 + ... + 107691.

It is an arithmetic number, because the mean of its divisors is an integer number (166788638).

Almost surely, 2^1000109991 is an apocalyptic number.

1000109991 is a deficient number, since it is larger than the sum of its proper divisors (334199113).

1000109991 is a wasteful number, since it uses less digits than its factorization.

1000109991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 207281.

The product of its (nonzero) digits is 729, while the sum is 30.

The square root of 1000109991 is about 31624.5156642754. The cubic root of 1000109991 is about 1000.0366623225.

Adding to 1000109991 its reverse (1999010001), we get a palindrome (2999119992).

The spelling of 1000109991 in words is "one billion, one hundred nine thousand, nine hundred ninety-one".