822581 has 2 divisors, whose sum is σ = 822582. Its totient is φ = 822580.

The previous prime is 822571. The next prime is 822587. The reversal of 822581 is 185228.

822581 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 654481 + 168100 = 809^2 + 410^2 .

It is a cyclic number.

It is not a de Polignac number, because 822581 - 2⁶ = 822517 is a prime.

It is a super-2 number, since 2×822581² = 1353279003122, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 822581.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (822587) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 411290 + 411291.

It is an arithmetic number, because the mean of its divisors is an integer number (411291).

2⁸²²⁵⁸¹ is an apocalyptic number.

It is an amenable number.

822581 is a deficient number, since it is larger than the sum of its proper divisors (1).

822581 is an equidigital number, since it uses as much as digits as its factorization.

822581 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1280, while the sum is 26.

The square root of 822581 is about 906.9625130070. The cubic root of 822581 is about 93.6971162483.

The spelling of 822581 in words is "eight hundred twenty-two thousand, five hundred eighty-one".