8205090813 has 6 divisors (see below), whose sum is σ = 11851797854. Its totient is φ = 5470060536.

The previous prime is 8205090809. The next prime is 8205090821. The reversal of 8205090813 is 3180905028.

It can be written as a sum of positive squares in only one way, i.e., 7695324729 + 509766084 = 87723^2 + 22578^2 .

It is not a de Polignac number, because 8205090813 - 2² = 8205090809 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8205090833) 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, 455838370 + ... + 455838387.

Almost surely, 2^8205090813 is an apocalyptic number.

It is an amenable number.

8205090813 is a deficient number, since it is larger than the sum of its proper divisors (3646707041).

8205090813 is a wasteful number, since it uses less digits than its factorization.

8205090813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 911676763 (or 911676760 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 36.

The square root of 8205090813 is about 90581.9563323734. The cubic root of 8205090813 is about 2016.9468968352.

The spelling of 8205090813 in words is "eight billion, two hundred five million, ninety thousand, eight hundred thirteen".