11001091091 has 4 divisors (see below), whose sum is σ = 11019643272. Its totient is φ = 10982538912.

The previous prime is 11001091033. The next prime is 11001091097. The reversal of 11001091091 is 19019010011.

It is a happy number.

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-11001091091 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11001091097) 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, 9275201 + ... + 9276386.

It is an arithmetic number, because the mean of its divisors is an integer number (2754910818).

Almost surely, 2^11001091091 is an apocalyptic number.

11001091091 is a deficient number, since it is larger than the sum of its proper divisors (18552181).

11001091091 is an equidigital number, since it uses as much as digits as its factorization.

11001091091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18552180.

The product of its (nonzero) digits is 81, while the sum is 23.

The spelling of 11001091091 in words is "eleven billion, one million, ninety-one thousand, ninety-one".