866351 has 4 divisors (see below), whose sum is σ = 884832. Its totient is φ = 847872.

The previous prime is 866329. The next prime is 866353. The reversal of 866351 is 153668.

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

It is a cyclic number.

It is not a de Polignac number, because 866351 - 2¹⁰ = 865327 is a prime.

It is a Duffinian number.

It is a plaindrome in base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (866353) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9170 + ... + 9263.

It is an arithmetic number, because the mean of its divisors is an integer number (221208).

2⁸⁶⁶³⁵¹ is an apocalyptic number.

866351 is a deficient number, since it is larger than the sum of its proper divisors (18481).

866351 is a wasteful number, since it uses less digits than its factorization.

866351 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18480.

The product of its digits is 4320, while the sum is 29.

The square root of 866351 is about 930.7797806141. The cubic root of 866351 is about 95.3303733032.

The spelling of 866351 in words is "eight hundred sixty-six thousand, three hundred fifty-one".