865163 has 8 divisors (see below), whose sum is σ = 947856. Its totient is φ = 784800.

The previous prime is 865159. The next prime is 865177. The reversal of 865163 is 361568.

865163 = T₁₃₇ + T₁₃₈ + ... + T₁₉₇.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 865163 - 2² = 865159 is a prime.

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (865103) 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 in 7 ways as a sum of consecutive naturals, for example, 248 + ... + 1338.

It is an arithmetic number, because the mean of its divisors is an integer number (118482).

2⁸⁶⁵¹⁶³ is an apocalyptic number.

865163 is a deficient number, since it is larger than the sum of its proper divisors (82693).

865163 is a wasteful number, since it uses less digits than its factorization.

865163 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1165.

The product of its digits is 4320, while the sum is 29.

The square root of 865163 is about 930.1413871020. The cubic root of 865163 is about 95.2867788518.

The spelling of 865163 in words is "eight hundred sixty-five thousand, one hundred sixty-three".