865159 has 2 divisors, whose sum is σ = 865160. Its totient is φ = 865158.

The previous prime is 865153. The next prime is 865177. The reversal of 865159 is 951568.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 865159 - 2¹⁷ = 734087 is a prime.

865159 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (865153) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 432579 + 432580.

It is an arithmetic number, because the mean of its divisors is an integer number (432580).

2⁸⁶⁵¹⁵⁹ is an apocalyptic number.

865159 is a deficient number, since it is larger than the sum of its proper divisors (1).

865159 is an equidigital number, since it uses as much as digits as its factorization.

865159 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10800, while the sum is 34.

The square root of 865159 is about 930.1392368888. The cubic root of 865159 is about 95.2866320018.

It can be divided in two parts, 865 and 159, that added together give a 10-th power (1024 = 2¹⁰).

The spelling of 865159 in words is "eight hundred sixty-five thousand, one hundred fifty-nine".