822861 has 18 divisors (see below), whose sum is σ = 1289418. Its totient is φ = 505440.

The previous prime is 822853. The next prime is 822881. The reversal of 822861 is 168228.

822861 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 3 ways, for example, as 2025 + 820836 = 45^2 + 906^2 .

It is not a de Polignac number, because 822861 - 2³ = 822853 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (822821) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 1251 + ... + 1791.

2⁸²²⁸⁶¹ is an apocalyptic number.

It is an amenable number.

822861 is a deficient number, since it is larger than the sum of its proper divisors (466557).

822861 is a wasteful number, since it uses less digits than its factorization.

822861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 573 (or 557 counting only the distinct ones).

The product of its digits is 1536, while the sum is 27.

The square root of 822861 is about 907.1168612698. The cubic root of 822861 is about 93.7077462922.

The spelling of 822861 in words is "eight hundred twenty-two thousand, eight hundred sixty-one".