8190991 has 8 divisors (see below), whose sum is σ = 8837424. Its totient is φ = 7562880.

The previous prime is 8190983. The next prime is 8190997. The reversal of 8190991 is 1990918.

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 8190991 - 2³ = 8190983 is a prime.

It is a Duffinian number.

It is a zygodrome in base 2.

It is a self number, because there is not a number n which added to its sum of digits gives 8190991.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8190997) 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, 3645 + ... + 5446.

It is an arithmetic number, because the mean of its divisors is an integer number (1104678).

Almost surely, 2^8190991 is an apocalyptic number.

8190991 is a deficient number, since it is larger than the sum of its proper divisors (646433).

8190991 is a wasteful number, since it uses less digits than its factorization.

8190991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9161.

The product of its (nonzero) digits is 5832, while the sum is 37.

The square root of 8190991 is about 2861.9907407258. The cubic root of 8190991 is about 201.5790912089.

The spelling of 8190991 in words is "eight million, one hundred ninety thousand, nine hundred ninety-one".