816169 has 2 divisors, whose sum is σ = 816170. Its totient is φ = 816168.

The previous prime is 816163. The next prime is 816191. The reversal of 816169 is 961618.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 700569 + 115600 = 837^2 + 340^2 .

It is a cyclic number.

It is not a de Polignac number, because 816169 - 2³ = 816161 is a prime.

It is a super-2 number, since 2×816169² = 1332263673122, which contains 22 as substring.

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

It is a self number, because there is not a number n which added to its sum of digits gives 816169.

It is not a weakly prime, because it can be changed into another prime (816161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 408084 + 408085.

It is an arithmetic number, because the mean of its divisors is an integer number (408085).

2⁸¹⁶¹⁶⁹ is an apocalyptic number.

It is an amenable number.

816169 is a deficient number, since it is larger than the sum of its proper divisors (1).

816169 is an equidigital number, since it uses as much as digits as its factorization.

816169 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2592, while the sum is 31.

The square root of 816169 is about 903.4207214803. The cubic root of 816169 is about 93.4530252946.

The spelling of 816169 in words is "eight hundred sixteen thousand, one hundred sixty-nine".