822056561 has 4 divisors (see below), whose sum is σ = 822116724. Its totient is φ = 821996400.

The previous prime is 822056537. The next prime is 822056579. The reversal of 822056561 is 165650228.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 588547600 + 233508961 = 24260^2 + 15281^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-822056561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (822056761) 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, 1391 + ... + 40571.

It is an arithmetic number, because the mean of its divisors is an integer number (205529181).

Almost surely, 2^822056561 is an apocalyptic number.

It is an amenable number.

822056561 is a deficient number, since it is larger than the sum of its proper divisors (60163).

822056561 is a wasteful number, since it uses less digits than its factorization.

822056561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60162.

The product of its (nonzero) digits is 28800, while the sum is 35.

The square root of 822056561 is about 28671.5287524052. The cubic root of 822056561 is about 936.7719972198.

The spelling of 822056561 in words is "eight hundred twenty-two million, fifty-six thousand, five hundred sixty-one".