811385 has 4 divisors (see below), whose sum is σ = 973668. Its totient is φ = 649104.

The previous prime is 811379. The next prime is 811387. The reversal of 811385 is 583118.

811385 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 583118 = 2 ⋅291559.

It can be written as a sum of positive squares in 2 ways, for example, as 153664 + 657721 = 392^2 + 811^2 .

It is a cyclic number.

It is not a de Polignac number, because 811385 - 2¹⁰ = 810361 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (811387) 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, 81134 + ... + 81143.

It is an arithmetic number, because the mean of its divisors is an integer number (243417).

2⁸¹¹³⁸⁵ is an apocalyptic number.

It is an amenable number.

811385 is a deficient number, since it is larger than the sum of its proper divisors (162283).

811385 is a wasteful number, since it uses less digits than its factorization.

811385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 162282.

The product of its digits is 960, while the sum is 26.

The square root of 811385 is about 900.7691158116. The cubic root of 811385 is about 93.2700747653.

The spelling of 811385 in words is "eight hundred eleven thousand, three hundred eighty-five".