822491 has 8 divisors (see below), whose sum is σ = 879120. Its totient is φ = 767232.

The previous prime is 822433. The next prime is 822517. The reversal of 822491 is 194228.

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 822491 - 2¹⁰ = 821467 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 822491.

It is not an unprimeable number, because it can be changed into a prime (822431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1091 + ... + 1683.

It is an arithmetic number, because the mean of its divisors is an integer number (109890).

2⁸²²⁴⁹¹ is an apocalyptic number.

822491 is a deficient number, since it is larger than the sum of its proper divisors (56629).

822491 is a wasteful number, since it uses less digits than its factorization.

822491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 685.

The product of its digits is 1152, while the sum is 26.

The square root of 822491 is about 906.9128954867. The cubic root of 822491 is about 93.6936989362.

The spelling of 822491 in words is "eight hundred twenty-two thousand, four hundred ninety-one".