822561 has 4 divisors (see below), whose sum is σ = 1096752. Its totient is φ = 548372.

The previous prime is 822557. The next prime is 822571. The reversal of 822561 is 165228.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 822561 - 2² = 822557 is a prime.

It is a D-number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (822541) 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, 137091 + ... + 137096.

It is an arithmetic number, because the mean of its divisors is an integer number (274188).

2⁸²²⁵⁶¹ is an apocalyptic number.

It is an amenable number.

822561 is a deficient number, since it is larger than the sum of its proper divisors (274191).

822561 is a wasteful number, since it uses less digits than its factorization.

822561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 274190.

The product of its digits is 960, while the sum is 24.

The square root of 822561 is about 906.9514871260. The cubic root of 822561 is about 93.6963568672.

Adding to 822561 its reverse (165228), we get a palindrome (987789).

The spelling of 822561 in words is "eight hundred twenty-two thousand, five hundred sixty-one".