865540071 has 48 divisors (see below), whose sum is σ = 1427991552. Its totient is φ = 500068800.

The previous prime is 865540069. The next prime is 865540097. The reversal of 865540071 is 170045568.

It is not a de Polignac number, because 865540071 - 2¹ = 865540069 is a prime.

It is a super-3 number, since 3×865540071³ (a number of 28 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (865540031) 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 47 ways as a sum of consecutive naturals, for example, 1053841 + ... + 1054661.

It is an arithmetic number, because the mean of its divisors is an integer number (29749824).

Almost surely, 2^865540071 is an apocalyptic number.

865540071 is a deficient number, since it is larger than the sum of its proper divisors (562451481).

865540071 is a wasteful number, since it uses less digits than its factorization.

865540071 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1324 (or 1321 counting only the distinct ones).

The product of its (nonzero) digits is 33600, while the sum is 36.

The square root of 865540071 is about 29420.0623894648. The cubic root of 865540071 is about 953.0062004414.

The spelling of 865540071 in words is "eight hundred sixty-five million, five hundred forty thousand, seventy-one".