855911 has 4 divisors (see below), whose sum is σ = 978192. Its totient is φ = 733632.

The previous prime is 855901. The next prime is 855919. The reversal of 855911 is 119558.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 119558 = 2 ⋅59779.

It is a cyclic number.

It is not a de Polignac number, because 855911 - 2¹⁸ = 593767 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (855919) 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, 61130 + ... + 61143.

It is an arithmetic number, because the mean of its divisors is an integer number (244548).

2⁸⁵⁵⁹¹¹ is an apocalyptic number.

855911 is a deficient number, since it is larger than the sum of its proper divisors (122281).

855911 is a wasteful number, since it uses less digits than its factorization.

855911 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122280.

The product of its digits is 1800, while the sum is 29.

The square root of 855911 is about 925.1545816781. The cubic root of 855911 is about 94.9458971719.

It can be divided in two parts, 8559 and 11, that multiplied together give a palindrome (94149).

The spelling of 855911 in words is "eight hundred fifty-five thousand, nine hundred eleven".