865291285 has 12 divisors (see below), whose sum is σ = 1047697092. Its totient is φ = 686056448.

The previous prime is 865291277. The next prime is 865291307. The reversal of 865291285 is 582192568.

It can be written as a sum of positive squares in 6 ways, for example, as 254657764 + 610633521 = 15958^2 + 24711^2 .

It is not a de Polignac number, because 865291285 - 2³ = 865291277 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 57069 + ... + 70621.

It is an arithmetic number, because the mean of its divisors is an integer number (87308091).

Almost surely, 2^865291285 is an apocalyptic number.

It is an amenable number.

865291285 is a deficient number, since it is larger than the sum of its proper divisors (182405807).

865291285 is a wasteful number, since it uses less digits than its factorization.

865291285 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13784 (or 13671 counting only the distinct ones).

The product of its digits is 345600, while the sum is 46.

The square root of 865291285 is about 29415.8339164471. The cubic root of 865291285 is about 952.9148827665.

The spelling of 865291285 in words is "eight hundred sixty-five million, two hundred ninety-one thousand, two hundred eighty-five".