822161 has 2 divisors, whose sum is σ = 822162. Its totient is φ = 822160.

The previous prime is 822139. The next prime is 822163. The reversal of 822161 is 161228.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 819025 + 3136 = 905^2 + 56^2 .

It is a cyclic number.

It is not a de Polignac number, because 822161 - 2¹⁸ = 560017 is a prime.

Together with 822163, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (822163) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 411080 + 411081.

It is an arithmetic number, because the mean of its divisors is an integer number (411081).

2⁸²²¹⁶¹ is an apocalyptic number.

It is an amenable number.

822161 is a deficient number, since it is larger than the sum of its proper divisors (1).

822161 is an equidigital number, since it uses as much as digits as its factorization.

822161 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 192, while the sum is 20.

The square root of 822161 is about 906.7309413492. The cubic root of 822161 is about 93.6811666586.

Adding to 822161 its reverse (161228), we get a palindrome (983389).

The spelling of 822161 in words is "eight hundred twenty-two thousand, one hundred sixty-one".