822091 has 4 divisors (see below), whose sum is σ = 842184. Its totient is φ = 802000.

The previous prime is 822079. The next prime is 822113. The reversal of 822091 is 190228.

822091 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 822091 - 2¹⁵ = 789323 is a prime.

It is a super-2 number, since 2×822091² = 1351667224562, which contains 22 as substring.

It is a Duffinian number.

822091 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (822011) 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, 9985 + ... + 10066.

It is an arithmetic number, because the mean of its divisors is an integer number (210546).

2⁸²²⁰⁹¹ is an apocalyptic number.

822091 is a deficient number, since it is larger than the sum of its proper divisors (20093).

822091 is a wasteful number, since it uses less digits than its factorization.

822091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20092.

The product of its (nonzero) digits is 288, while the sum is 22.

The square root of 822091 is about 906.6923403228. The cubic root of 822091 is about 93.6785078656.

The spelling of 822091 in words is "eight hundred twenty-two thousand, ninety-one".