812817 has 6 divisors (see below), whose sum is σ = 1174082. Its totient is φ = 541872.

The previous prime is 812807. The next prime is 812849. The reversal of 812817 is 718218.

It can be written as a sum of positive squares in only one way, i.e., 408321 + 404496 = 639^2 + 636^2 .

It is not a de Polignac number, because 812817 - 2⁷ = 812689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (812807) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 45148 + ... + 45165.

2⁸¹²⁸¹⁷ is an apocalyptic number.

It is an amenable number.

812817 is a deficient number, since it is larger than the sum of its proper divisors (361265).

812817 is a wasteful number, since it uses less digits than its factorization.

812817 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90319 (or 90316 counting only the distinct ones).

The product of its digits is 896, while the sum is 27.

The square root of 812817 is about 901.5636416804. The cubic root of 812817 is about 93.3249127891.

The spelling of 812817 in words is "eight hundred twelve thousand, eight hundred seventeen".