9011820991 has 4 divisors (see below), whose sum is σ = 9020665800. Its totient is φ = 9002976184.

The previous prime is 9011820967. The next prime is 9011821001. The reversal of 9011820991 is 1990281109.

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 9011820991 - 2⁵ = 9011820959 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 (9011820901) 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, 4420876 + ... + 4422913.

It is an arithmetic number, because the mean of its divisors is an integer number (2255166450).

Almost surely, 2^9011820991 is an apocalyptic number.

9011820991 is a deficient number, since it is larger than the sum of its proper divisors (8844809).

9011820991 is a wasteful number, since it uses less digits than its factorization.

9011820991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8844808.

The product of its (nonzero) digits is 11664, while the sum is 40.

The square root of 9011820991 is about 94930.6114538403. The cubic root of 9011820991 is about 2080.9941154494.

The spelling of 9011820991 in words is "nine billion, eleven million, eight hundred twenty thousand, nine hundred ninety-one".