1000009091 has 4 divisors (see below), whose sum is σ = 1001713272. Its totient is φ = 998304912.

The previous prime is 1000009081. The next prime is 1000009093. The reversal of 1000009091 is 1909000001.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1909000001 = 2699 ⋅707299.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1000009091 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1000009093) 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, 851210 + ... + 852383.

It is an arithmetic number, because the mean of its divisors is an integer number (250428318).

Almost surely, 2^1000009091 is an apocalyptic number.

1000009091 is a deficient number, since it is larger than the sum of its proper divisors (1704181).

1000009091 is an equidigital number, since it uses as much as digits as its factorization.

1000009091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1704180.

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

The square root of 1000009091 is about 31622.9203426881. The cubic root of 1000009091 is about 1000.0030303242.

Adding to 1000009091 its reverse (1909000001), we get a palindrome (2909009092).

The spelling of 1000009091 in words is "one billion, nine thousand, ninety-one".