855565 has 8 divisors (see below), whose sum is σ = 1035000. Its totient is φ = 678912.

The previous prime is 855527. The next prime is 855581. The reversal of 855565 is 565558.

855565 is nontrivially palindromic in base 16.

It can be written as a sum of positive squares in 4 ways, for example, as 84681 + 770884 = 291^2 + 878^2 .

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 855565 - 2¹³ = 847373 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 855565.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 61 + ... + 1309.

It is an arithmetic number, because the mean of its divisors is an integer number (129375).

2⁸⁵⁵⁵⁶⁵ is an apocalyptic number.

It is an amenable number.

855565 is a deficient number, since it is larger than the sum of its proper divisors (179435).

855565 is a wasteful number, since it uses less digits than its factorization.

855565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1391.

The product of its digits is 30000, while the sum is 34.

The square root of 855565 is about 924.9675669990. The cubic root of 855565 is about 94.9331015627.

The spelling of 855565 in words is "eight hundred fifty-five thousand, five hundred sixty-five".