3818320813 has 2 divisors, whose sum is σ = 3818320814. Its totient is φ = 3818320812.

The previous prime is 3818320801. The next prime is 3818320829. The reversal of 3818320813 is 3180238183.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3308780484 + 509540329 = 57522^2 + 22573^2 .

It is a cyclic number.

It is not a de Polignac number, because 3818320813 - 2²¹ = 3816223661 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3818320613) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1909160406 + 1909160407.

It is an arithmetic number, because the mean of its divisors is an integer number (1909160407).

Almost surely, 2^3818320813 is an apocalyptic number.

It is an amenable number.

3818320813 is a deficient number, since it is larger than the sum of its proper divisors (1).

3818320813 is an equidigital number, since it uses as much as digits as its factorization.

3818320813 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27648, while the sum is 37.

The square root of 3818320813 is about 61792.5627644622. The cubic root of 3818320813 is about 1562.9945784361.

Adding to 3818320813 its reverse (3180238183), we get a palindrome (6998558996).

It can be divided in two parts, 38183 and 20813, that added together give a triangular number (58996 = T₃₄₃).

The spelling of 3818320813 in words is "three billion, eight hundred eighteen million, three hundred twenty thousand, eight hundred thirteen".