9421809991 has 8 divisors (see below), whose sum is σ = 10279756944. Its totient is φ = 8564099520.

The previous prime is 9421809973. The next prime is 9421809997. The reversal of 9421809991 is 1999081249.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 9421809991 - 2¹⁹ = 9421285703 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 (9421809997) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30045 + ... + 140521.

It is an arithmetic number, because the mean of its divisors is an integer number (1284969618).

Almost surely, 2^9421809991 is an apocalyptic number.

9421809991 is a deficient number, since it is larger than the sum of its proper divisors (857946953).

9421809991 is a wasteful number, since it uses less digits than its factorization.

9421809991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 118241.

The product of its (nonzero) digits is 419904, while the sum is 52.

The square root of 9421809991 is about 97066.0084221042. The cubic root of 9421809991 is about 2112.0852673974.

The spelling of 9421809991 in words is "nine billion, four hundred twenty-one million, eight hundred nine thousand, nine hundred ninety-one".