822813 has 4 divisors (see below), whose sum is σ = 1097088. Its totient is φ = 548540.

The previous prime is 822803. The next prime is 822821. The reversal of 822813 is 318228.

822813 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 822813 - 2⁵ = 822781 is a prime.

It is a D-number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (822803) 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, 137133 + ... + 137138.

It is an arithmetic number, because the mean of its divisors is an integer number (274272).

2⁸²²⁸¹³ is an apocalyptic number.

It is an amenable number.

822813 is a deficient number, since it is larger than the sum of its proper divisors (274275).

822813 is a wasteful number, since it uses less digits than its factorization.

822813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 274274.

The product of its digits is 768, while the sum is 24.

The square root of 822813 is about 907.0904034329. The cubic root of 822813 is about 93.7059241702.

The spelling of 822813 in words is "eight hundred twenty-two thousand, eight hundred thirteen".