822620861 has 4 divisors (see below), whose sum is σ = 830765724. Its totient is φ = 814476000.

The previous prime is 822620833. The next prime is 822620879. The reversal of 822620861 is 168026228.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 666620761 + 156000100 = 25819^2 + 12490^2 .

It is a cyclic number.

It is not a de Polignac number, because 822620861 - 2⁶ = 822620797 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (822620801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4072280 + ... + 4072481.

It is an arithmetic number, because the mean of its divisors is an integer number (207691431).

Almost surely, 2^822620861 is an apocalyptic number.

It is an amenable number.

822620861 is a deficient number, since it is larger than the sum of its proper divisors (8144863).

822620861 is a wasteful number, since it uses less digits than its factorization.

822620861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8144862.

The product of its (nonzero) digits is 18432, while the sum is 35.

The square root of 822620861 is about 28681.3678369774. The cubic root of 822620861 is about 936.9862969620.

The spelling of 822620861 in words is "eight hundred twenty-two million, six hundred twenty thousand, eight hundred sixty-one".