1001109999 has 24 divisors (see below), whose sum is σ = 1380773520. Its totient is φ = 645156864.

The previous prime is 1001109973. The next prime is 1001110007. The reversal of 1001109999 is 9999011001.

It is not a de Polignac number, because 1001109999 - 2⁷ = 1001109871 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1001109919) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 709807 + ... + 711215.

It is an arithmetic number, because the mean of its divisors is an integer number (57532230).

Almost surely, 2^1001109999 is an apocalyptic number.

1001109999 is a deficient number, since it is larger than the sum of its proper divisors (379663521).

1001109999 is a wasteful number, since it uses less digits than its factorization.

1001109999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1659 (or 1622 counting only the distinct ones).

The product of its (nonzero) digits is 6561, while the sum is 39.

The square root of 1001109999 is about 31640.3223592934. The cubic root of 1001109999 is about 1000.3698628513.

The spelling of 1001109999 in words is "one billion, one million, one hundred nine thousand, nine hundred ninety-nine".