816769 has 2 divisors, whose sum is σ = 816770. Its totient is φ = 816768.

The previous prime is 816763. The next prime is 816779. The reversal of 816769 is 967618.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 442225 + 374544 = 665^2 + 612^2 .

It is a cyclic number.

It is not a de Polignac number, because 816769 - 2¹⁷ = 685697 is a prime.

It is a super-2 number, since 2×816769² = 1334223198722, which contains 22 as substring.

It is a Chen prime.

It is an alternating number because its digits alternate between even and odd.

It is not a weakly prime, because it can be changed into another prime (816763) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 408384 + 408385.

It is an arithmetic number, because the mean of its divisors is an integer number (408385).

2⁸¹⁶⁷⁶⁹ is an apocalyptic number.

It is an amenable number.

816769 is a deficient number, since it is larger than the sum of its proper divisors (1).

816769 is an equidigital number, since it uses as much as digits as its factorization.

816769 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18144, while the sum is 37.

The square root of 816769 is about 903.7527316695. The cubic root of 816769 is about 93.4759200956.

The spelling of 816769 in words is "eight hundred sixteen thousand, seven hundred sixty-nine".