855617 has 4 divisors (see below), whose sum is σ = 977856. Its totient is φ = 733380.

The previous prime is 855607. The next prime is 855619. The reversal of 855617 is 716558.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 716558 = 2 ⋅358279.

It is a cyclic number.

It is not a de Polignac number, because 855617 - 2⁴ = 855601 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (855619) 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, 61109 + ... + 61122.

It is an arithmetic number, because the mean of its divisors is an integer number (244464).

2⁸⁵⁵⁶¹⁷ is an apocalyptic number.

It is an amenable number.

855617 is a deficient number, since it is larger than the sum of its proper divisors (122239).

855617 is a wasteful number, since it uses less digits than its factorization.

855617 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122238.

The product of its digits is 8400, while the sum is 32.

The square root of 855617 is about 924.9956756656. The cubic root of 855617 is about 94.9350248225.

The spelling of 855617 in words is "eight hundred fifty-five thousand, six hundred seventeen".