816231 has 8 divisors (see below), whose sum is σ = 1172080. Its totient is φ = 502272.

The previous prime is 816227. The next prime is 816239. The reversal of 816231 is 132618.

816231 is nontrivially palindromic in base 12.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 816231 - 2² = 816227 is a prime.

It is a super-2 number, since 2×816231² = 1332466090722, which contains 22 as substring.

It is a zygodrome in base 12.

It is a junction number, because it is equal to n+sod(n) for n = 816198 and 816207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (816239) 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 7 ways as a sum of consecutive naturals, for example, 10426 + ... + 10503.

It is an arithmetic number, because the mean of its divisors is an integer number (146510).

2⁸¹⁶²³¹ is an apocalyptic number.

816231 is a deficient number, since it is larger than the sum of its proper divisors (355849).

816231 is a wasteful number, since it uses less digits than its factorization.

816231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20945.

The product of its digits is 288, while the sum is 21.

The square root of 816231 is about 903.4550348523. The cubic root of 816231 is about 93.4553916105.

Adding to 816231 its reverse (132618), we get a palindrome (948849).

The spelling of 816231 in words is "eight hundred sixteen thousand, two hundred thirty-one".