856165 has 4 divisors (see below), whose sum is σ = 1027404. Its totient is φ = 684928.

The previous prime is 856153. The next prime is 856169. The reversal of 856165 is 561658.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 173889 + 682276 = 417^2 + 826^2 .

It is a cyclic number.

It is not a de Polignac number, because 856165 - 2⁵ = 856133 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (856169) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 85612 + ... + 85621.

It is an arithmetic number, because the mean of its divisors is an integer number (256851).

2⁸⁵⁶¹⁶⁵ is an apocalyptic number.

It is an amenable number.

856165 is a deficient number, since it is larger than the sum of its proper divisors (171239).

856165 is a wasteful number, since it uses less digits than its factorization.

856165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 171238.

The product of its digits is 7200, while the sum is 31.

The square root of 856165 is about 925.2918458519. The cubic root of 856165 is about 94.9552882857.

The spelling of 856165 in words is "eight hundred fifty-six thousand, one hundred sixty-five".