813486217 has 4 divisors (see below), whose sum is σ = 813550996. Its totient is φ = 813421440.

The previous prime is 813486203. The next prime is 813486239. The reversal of 813486217 is 712684318.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 712684318 = 2 ⋅356342159.

It can be written as a sum of positive squares in 2 ways, for example, as 373996921 + 439489296 = 19339^2 + 20964^2 .

It is a cyclic number.

It is not a de Polignac number, because 813486217 - 2¹⁵ = 813453449 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 813486217.

It is not an unprimeable number, because it can be changed into a prime (813586217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6828 + ... + 40909.

It is an arithmetic number, because the mean of its divisors is an integer number (203387749).

Almost surely, 2^813486217 is an apocalyptic number.

It is an amenable number.

813486217 is a deficient number, since it is larger than the sum of its proper divisors (64779).

813486217 is a wasteful number, since it uses less digits than its factorization.

813486217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64778.

The product of its digits is 64512, while the sum is 40.

The square root of 813486217 is about 28521.6797717105. The cubic root of 813486217 is about 933.5051817780.

The spelling of 813486217 in words is "eight hundred thirteen million, four hundred eighty-six thousand, two hundred seventeen".