8165813 has 2 divisors, whose sum is σ = 8165814. Its totient is φ = 8165812.

The previous prime is 8165809. The next prime is 8165867. The reversal of 8165813 is 3185618.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8162449 + 3364 = 2857^2 + 58^2 .

It is a cyclic number.

It is not a de Polignac number, because 8165813 - 2² = 8165809 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 8165813.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8165873) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4082906 + 4082907.

It is an arithmetic number, because the mean of its divisors is an integer number (4082907).

Almost surely, 2^8165813 is an apocalyptic number.

It is an amenable number.

8165813 is a deficient number, since it is larger than the sum of its proper divisors (1).

8165813 is an equidigital number, since it uses as much as digits as its factorization.

8165813 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5760, while the sum is 32.

The square root of 8165813 is about 2857.5886687905. The cubic root of 8165813 is about 201.3723369191.

The spelling of 8165813 in words is "eight million, one hundred sixty-five thousand, eight hundred thirteen".