852685621 has 2 divisors, whose sum is σ = 852685622. Its totient is φ = 852685620.

The previous prime is 852685619. The next prime is 852685661. The reversal of 852685621 is 126586258.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 574129521 + 278556100 = 23961^2 + 16690^2 .

It is a cyclic number.

It is not a de Polignac number, because 852685621 - 2¹ = 852685619 is a prime.

Together with 852685619, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (852685661) 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 as a sum of consecutive naturals, namely, 426342810 + 426342811.

It is an arithmetic number, because the mean of its divisors is an integer number (426342811).

Almost surely, 2^852685621 is an apocalyptic number.

It is an amenable number.

852685621 is a deficient number, since it is larger than the sum of its proper divisors (1).

852685621 is an equidigital number, since it uses as much as digits as its factorization.

852685621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 230400, while the sum is 43.

The square root of 852685621 is about 29200.7811710577. The cubic root of 852685621 is about 948.2648367381.

The spelling of 852685621 in words is "eight hundred fifty-two million, six hundred eighty-five thousand, six hundred twenty-one".