8221091 has 8 divisors (see below), whose sum is σ = 8724480. Its totient is φ = 7724808.

The previous prime is 8221069. The next prime is 8221111. The reversal of 8221091 is 1901228.

8221091 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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 8221091 - 2⁶ = 8221027 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8221021) 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, 710 + ... + 4116.

It is an arithmetic number, because the mean of its divisors is an integer number (1090560).

Almost surely, 2^8221091 is an apocalyptic number.

8221091 is a deficient number, since it is larger than the sum of its proper divisors (503389).

8221091 is a wasteful number, since it uses less digits than its factorization.

8221091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3553.

The product of its (nonzero) digits is 288, while the sum is 23.

The square root of 8221091 is about 2867.2444960275. The cubic root of 8221091 is about 201.8257082350.

The spelling of 8221091 in words is "eight million, two hundred twenty-one thousand, ninety-one".