885691 has 4 divisors (see below), whose sum is σ = 892584. Its totient is φ = 878800.

The previous prime is 885679. The next prime is 885713. The reversal of 885691 is 196588.

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

It is a 4-Lehmer number, since φ(885691) divides (885691-1)⁴.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-885691 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 885691.

It is not an unprimeable number, because it can be changed into a prime (885611) 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, 3250 + ... + 3511.

It is an arithmetic number, because the mean of its divisors is an integer number (223146).

2⁸⁸⁵⁶⁹¹ is an apocalyptic number.

885691 is a deficient number, since it is larger than the sum of its proper divisors (6893).

885691 is a wasteful number, since it uses less digits than its factorization.

885691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6892.

The product of its digits is 17280, while the sum is 37.

The square root of 885691 is about 941.1115768069. Note that the first 3 decimals coincide. The cubic root of 885691 is about 96.0345289566.

The spelling of 885691 in words is "eight hundred eighty-five thousand, six hundred ninety-one".