817730813 has 4 divisors (see below), whose sum is σ = 819163488. Its totient is φ = 816298140.

The previous prime is 817730801. The next prime is 817730819. The reversal of 817730813 is 318037718.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-817730813 is a prime.

It is a super-3 number, since 3×817730813³ (a number of 28 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (817730819) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 715481 + ... + 716622.

It is an arithmetic number, because the mean of its divisors is an integer number (204790872).

Almost surely, 2^817730813 is an apocalyptic number.

It is an amenable number.

817730813 is a deficient number, since it is larger than the sum of its proper divisors (1432675).

817730813 is a wasteful number, since it uses less digits than its factorization.

817730813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1432674.

The product of its (nonzero) digits is 28224, while the sum is 38.

The square root of 817730813 is about 28595.9929535591. The cubic root of 817730813 is about 935.1259757625.

The spelling of 817730813 in words is "eight hundred seventeen million, seven hundred thirty thousand, eight hundred thirteen".