1009091009999 has 4 divisors (see below), whose sum is σ = 1019082010200. Its totient is φ = 999100009800.

The previous prime is 1009091009939. The next prime is 1009091010001. The reversal of 1009091009999 is 9999001909001.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1009091009999 - 2³⁶ = 940371533263 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 (1009091009939) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4995499949 + ... + 4995500150.

It is an arithmetic number, because the mean of its divisors is an integer number (254770502550).

Almost surely, 2^{1009091009999} is an apocalyptic number.

1009091009999 is a deficient number, since it is larger than the sum of its proper divisors (9991000201).

1009091009999 is an equidigital number, since it uses as much as digits as its factorization.

1009091009999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9991000200.

The product of its (nonzero) digits is 531441, while the sum is 56.

The spelling of 1009091009999 in words is "one trillion, nine billion, ninety-one million, nine thousand, nine hundred ninety-nine".