816841 has 2 divisors, whose sum is σ = 816842. Its totient is φ = 816840.

The previous prime is 816839. The next prime is 816847. The reversal of 816841 is 148618.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 687241 + 129600 = 829^2 + 360^2 .

It is a cyclic number.

It is not a de Polignac number, because 816841 - 2¹ = 816839 is a prime.

Together with 816839, it forms a pair of twin primes.

816841 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (816847) 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 as a sum of consecutive naturals, namely, 408420 + 408421.

It is an arithmetic number, because the mean of its divisors is an integer number (408421).

2⁸¹⁶⁸⁴¹ is an apocalyptic number.

It is an amenable number.

816841 is a deficient number, since it is larger than the sum of its proper divisors (1).

816841 is an equidigital number, since it uses as much as digits as its factorization.

816841 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1536, while the sum is 28.

The square root of 816841 is about 903.7925646961. The cubic root of 816841 is about 93.4786667182.

The spelling of 816841 in words is "eight hundred sixteen thousand, eight hundred forty-one".