865371213 has 36 divisors (see below), whose sum is σ = 1539605340. Its totient is φ = 465405696.

The previous prime is 865371161. The next prime is 865371257. The reversal of 865371213 is 312173568.

It can be written as a sum of positive squares in 2 ways, for example, as 426133449 + 439237764 = 20643^2 + 20958^2 .

It is not a de Polignac number, because 865371213 - 2¹⁰ = 865370189 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (865371413) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 50218 + ... + 65211.

It is an arithmetic number, because the mean of its divisors is an integer number (42766815).

Almost surely, 2^865371213 is an apocalyptic number.

It is an amenable number.

865371213 is a deficient number, since it is larger than the sum of its proper divisors (674234127).

865371213 is a wasteful number, since it uses less digits than its factorization.

865371213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115466 (or 115456 counting only the distinct ones).

The product of its digits is 30240, while the sum is 36.

The square root of 865371213 is about 29417.1924731100. The cubic root of 865371213 is about 952.9442224956.

The spelling of 865371213 in words is "eight hundred sixty-five million, three hundred seventy-one thousand, two hundred thirteen".