816931 has 8 divisors (see below), whose sum is σ = 844560. Its totient is φ = 789888.

The previous prime is 816929. The next prime is 816941. The reversal of 816931 is 139618.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 816931 - 2¹ = 816929 is a prime.

It is a super-3 number, since 3×816931³ = 1635601063337647473, which contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a plaindrome in base 13.

It is a self number, because there is not a number n which added to its sum of digits gives 816931.

It is not an unprimeable number, because it can be changed into a prime (816911) 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, 5895 + ... + 6031.

It is an arithmetic number, because the mean of its divisors is an integer number (105570).

2⁸¹⁶⁹³¹ is an apocalyptic number.

816931 is a deficient number, since it is larger than the sum of its proper divisors (27629).

816931 is a wasteful number, since it uses less digits than its factorization.

816931 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 293.

The product of its digits is 1296, while the sum is 28.

The square root of 816931 is about 903.8423535108. The cubic root of 816931 is about 93.4820997694.

The spelling of 816931 in words is "eight hundred sixteen thousand, nine hundred thirty-one".