822551 has 2 divisors, whose sum is σ = 822552. Its totient is φ = 822550.

The previous prime is 822541. The next prime is 822553. The reversal of 822551 is 155228.

822551 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 is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-822551 is a prime.

Together with 822553, it forms a pair of twin primes.

It is a Chen prime.

It is equal to p₆₅₆₀₆ and since 822551 and 65606 have the same sum of digits, it is a Honaker prime.

It is a plaindrome in base 15.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (822553) 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, 411275 + 411276.

It is an arithmetic number, because the mean of its divisors is an integer number (411276).

2⁸²²⁵⁵¹ is an apocalyptic number.

822551 is a deficient number, since it is larger than the sum of its proper divisors (1).

822551 is an equidigital number, since it uses as much as digits as its factorization.

822551 is an evil number, because the sum of its binary digits is even.

The product of its digits is 800, while the sum is 23.

The square root of 822551 is about 906.9459741352. The cubic root of 822551 is about 93.6959771720.

Adding to 822551 its reverse (155228), we get a palindrome (977779).

The spelling of 822551 in words is "eight hundred twenty-two thousand, five hundred fifty-one".