866331 has 6 divisors (see below), whose sum is σ = 1251380. Its totient is φ = 577548.

The previous prime is 866329. The next prime is 866353. The reversal of 866331 is 133668.

866331 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 866331 - 2¹ = 866329 is a prime.

It is a super-2 number, since 2×866331² = 1501058803122, which contains 22 as substring.

It is an Ulam number.

It is a Duffinian number.

It is a nialpdrome in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 866295 and 866304.

It is not an unprimeable number, because it can be changed into a prime (866311) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 48121 + ... + 48138.

2⁸⁶⁶³³¹ is an apocalyptic number.

866331 is a deficient number, since it is larger than the sum of its proper divisors (385049).

866331 is a wasteful number, since it uses less digits than its factorization.

866331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96265 (or 96262 counting only the distinct ones).

The product of its digits is 2592, while the sum is 27.

The square root of 866331 is about 930.7690368722. The cubic root of 866331 is about 95.3296397198.

Adding to 866331 its reverse (133668), we get a palindrome (999999).

The spelling of 866331 in words is "eight hundred sixty-six thousand, three hundred thirty-one".