821313085 has 4 divisors (see below), whose sum is σ = 985575708. Its totient is φ = 657050464.

The previous prime is 821313083. The next prime is 821313121. The reversal of 821313085 is 580313128.

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 112741924 + 708571161 = 10618^2 + 26619^2 .

It is a cyclic number.

It is not a de Polignac number, because 821313085 - 2¹ = 821313083 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (821313083) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 82131304 + ... + 82131313.

It is an arithmetic number, because the mean of its divisors is an integer number (246393927).

Almost surely, 2^821313085 is an apocalyptic number.

It is an amenable number.

821313085 is a deficient number, since it is larger than the sum of its proper divisors (164262623).

821313085 is a wasteful number, since it uses less digits than its factorization.

821313085 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 164262622.

The product of its (nonzero) digits is 5760, while the sum is 31.

The square root of 821313085 is about 28658.5604139496. The cubic root of 821313085 is about 936.4895034515.

The spelling of 821313085 in words is "eight hundred twenty-one million, three hundred thirteen thousand, eighty-five".