816593 has 2 divisors, whose sum is σ = 816594. Its totient is φ = 816592.

The previous prime is 816589. The next prime is 816649. The reversal of 816593 is 395618.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 744769 + 71824 = 863^2 + 268^2 .

It is a cyclic number.

It is not a de Polignac number, because 816593 - 2² = 816589 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a plaindrome in base 13.

It is not a weakly prime, because it can be changed into another prime (819593) 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, 408296 + 408297.

It is an arithmetic number, because the mean of its divisors is an integer number (408297).

2⁸¹⁶⁵⁹³ is an apocalyptic number.

It is an amenable number.

816593 is a deficient number, since it is larger than the sum of its proper divisors (1).

816593 is an equidigital number, since it uses as much as digits as its factorization.

816593 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6480, while the sum is 32.

The square root of 816593 is about 903.6553546569. The cubic root of 816593 is about 93.4692054498.

The spelling of 816593 in words is "eight hundred sixteen thousand, five hundred ninety-three".