822212609 has 4 divisors (see below), whose sum is σ = 823554516. Its totient is φ = 820870704.

The previous prime is 822212603. The next prime is 822212627. The reversal of 822212609 is 906212228.

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 155127025 + 667085584 = 12455^2 + 25828^2 .

It is a cyclic number.

It is not a de Polignac number, because 822212609 - 2⁸ = 822212353 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (822212603) 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, 670034 + ... + 671259.

It is an arithmetic number, because the mean of its divisors is an integer number (205888629).

Almost surely, 2^822212609 is an apocalyptic number.

It is an amenable number.

822212609 is a deficient number, since it is larger than the sum of its proper divisors (1341907).

822212609 is a wasteful number, since it uses less digits than its factorization.

822212609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1341906.

The product of its (nonzero) digits is 6912, while the sum is 32.

The square root of 822212609 is about 28674.2499291612. The cubic root of 822212609 is about 936.8312681406.

The spelling of 822212609 in words is "eight hundred twenty-two million, two hundred twelve thousand, six hundred nine".