618217813 has 2 divisors, whose sum is σ = 618217814. Its totient is φ = 618217812.

The previous prime is 618217723. The next prime is 618217819. The reversal of 618217813 is 318712816.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 613899729 + 4318084 = 24777^2 + 2078^2 .

It is a cyclic number.

It is not a de Polignac number, because 618217813 - 2¹³ = 618209621 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (618217819) 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 as a sum of consecutive naturals, namely, 309108906 + 309108907.

It is an arithmetic number, because the mean of its divisors is an integer number (309108907).

Almost surely, 2^618217813 is an apocalyptic number.

It is an amenable number.

618217813 is a deficient number, since it is larger than the sum of its proper divisors (1).

618217813 is an equidigital number, since it uses as much as digits as its factorization.

618217813 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 16128, while the sum is 37.

The square root of 618217813 is about 24863.9862652793. The cubic root of 618217813 is about 851.8840850666.

The spelling of 618217813 in words is "six hundred eighteen million, two hundred seventeen thousand, eight hundred thirteen".