865852213 has 4 divisors (see below), whose sum is σ = 868618828. Its totient is φ = 863085600.

The previous prime is 865852201. The next prime is 865852223. The reversal of 865852213 is 312258568.

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 191047684 + 674804529 = 13822^2 + 25977^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-865852213 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 (865852223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1382838 + ... + 1383463.

It is an arithmetic number, because the mean of its divisors is an integer number (217154707).

Almost surely, 2^865852213 is an apocalyptic number.

It is an amenable number.

865852213 is a deficient number, since it is larger than the sum of its proper divisors (2766615).

865852213 is a wasteful number, since it uses less digits than its factorization.

865852213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2766614.

The product of its digits is 115200, while the sum is 40.

The square root of 865852213 is about 29425.3668286395. The cubic root of 865852213 is about 953.1207483863.

The spelling of 865852213 in words is "eight hundred sixty-five million, eight hundred fifty-two thousand, two hundred thirteen".