816523 has 8 divisors (see below), whose sum is σ = 861696. Its totient is φ = 772200.

The previous prime is 816521. The next prime is 816539. The reversal of 816523 is 325618.

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 816523 - 2¹ = 816521 is a prime.

It is a d-powerful number, because it can be written as 8⁴ + 1 + 5² + 6⁷ + 2¹⁰ + 3¹² .

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

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (816521) 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, 2878 + ... + 3148.

It is an arithmetic number, because the mean of its divisors is an integer number (107712).

2⁸¹⁶⁵²³ is an apocalyptic number.

816523 is a deficient number, since it is larger than the sum of its proper divisors (45173).

816523 is a wasteful number, since it uses less digits than its factorization.

816523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 425.

The product of its digits is 1440, while the sum is 25.

The square root of 816523 is about 903.6166222464. The cubic root of 816523 is about 93.4665345838.

The spelling of 816523 in words is "eight hundred sixteen thousand, five hundred twenty-three".