1000000009091 has 4 divisors (see below), whose sum is σ = 1000107765384. Its totient is φ = 999892252800.

The previous prime is 1000000009069. The next prime is 1000000009147. The reversal of 1000000009091 is 1909000000001.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1000000009091 is a prime.

It is a Duffinian number.

1000000009091 is a modest number, since divided by 9091 gives 100 as remainder.

It is not an unprimeable number, because it can be changed into a prime (1000000009691) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 53864225 + ... + 53882786.

It is an arithmetic number, because the mean of its divisors is an integer number (250026941346).

Almost surely, 2^{1000000009091} is an apocalyptic number.

1000000009091 is a deficient number, since it is larger than the sum of its proper divisors (107756293).

1000000009091 is an equidigital number, since it uses as much as digits as its factorization.

1000000009091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107756292.

The product of its (nonzero) digits is 81, while the sum is 20.

Adding to 1000000009091 its reverse (1909000000001), we get a palindrome (2909000009092).

The spelling of 1000000009091 in words is "one trillion, nine thousand, ninety-one".