865318689 has 12 divisors (see below), whose sum is σ = 1250513316. Its totient is φ = 576598272.

The previous prime is 865318687. The next prime is 865318703. The reversal of 865318689 is 986813568.

It can be written as a sum of positive squares in 2 ways, for example, as 228614400 + 636704289 = 15120^2 + 25233^2 .

It is not a de Polignac number, because 865318689 - 2¹ = 865318687 is a prime.

It is not an unprimeable number, because it can be changed into a prime (865318681) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2952 + ... + 41705.

It is an arithmetic number, because the mean of its divisors is an integer number (104209443).

Almost surely, 2^865318689 is an apocalyptic number.

It is an amenable number.

865318689 is a deficient number, since it is larger than the sum of its proper divisors (385194627).

865318689 is a wasteful number, since it uses less digits than its factorization.

865318689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46816 (or 46813 counting only the distinct ones).

The product of its digits is 2488320, while the sum is 54.

The square root of 865318689 is about 29416.2997163137. The cubic root of 865318689 is about 952.9249423476.

The spelling of 865318689 in words is "eight hundred sixty-five million, three hundred eighteen thousand, six hundred eighty-nine".