10000009091 has 4 divisors (see below), whose sum is σ = 10099019184. Its totient is φ = 9900999000.

The previous prime is 10000009081. The next prime is 10000009139. The reversal of 10000009091 is 19090000001.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19090000001 = 101 ⋅189009901.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-10000009091 is a prime.

It is a Duffinian number.

10000009091 is a modest number, since divided by 9091 gives 1 as remainder.

It is not an unprimeable number, because it can be changed into a prime (10000009021) 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, 49504895 + ... + 49505096.

It is an arithmetic number, because the mean of its divisors is an integer number (2524754796).

Almost surely, 2^10000009091 is an apocalyptic number.

10000009091 is a deficient number, since it is larger than the sum of its proper divisors (99010093).

10000009091 is an equidigital number, since it uses as much as digits as its factorization.

10000009091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99010092.

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

Adding to 10000009091 its reverse (19090000001), we get a palindrome (29090009092).

The spelling of 10000009091 in words is "ten billion, nine thousand, ninety-one".