866291 has 4 divisors (see below), whose sum is σ = 878232. Its totient is φ = 854352.

The previous prime is 866279. The next prime is 866293. The reversal of 866291 is 192668.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-866291 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (866293) 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, 5861 + ... + 6006.

It is an arithmetic number, because the mean of its divisors is an integer number (219558).

2⁸⁶⁶²⁹¹ is an apocalyptic number.

866291 is a deficient number, since it is larger than the sum of its proper divisors (11941).

866291 is a wasteful number, since it uses less digits than its factorization.

866291 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11940.

The product of its digits is 5184, while the sum is 32.

The square root of 866291 is about 930.7475490164. The cubic root of 866291 is about 95.3281725191.

The spelling of 866291 in words is "eight hundred sixty-six thousand, two hundred ninety-one".