381818818193 has 2 divisors, whose sum is σ = 381818818194. Its totient is φ = 381818818192.

The previous prime is 381818818103. The next prime is 381818818207. The reversal of 381818818193 is 391818818183.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 231392747089 + 150426071104 = 481033^2 + 387848^2 .

It is a cyclic number.

It is not a de Polignac number, because 381818818193 - 2⁸ = 381818817937 is a prime.

It is not a weakly prime, because it can be changed into another prime (381818818103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 190909409096 + 190909409097.

It is an arithmetic number, because the mean of its divisors is an integer number (190909409097).

Almost surely, 2^381818818193 is an apocalyptic number.

It is an amenable number.

381818818193 is a deficient number, since it is larger than the sum of its proper divisors (1).

381818818193 is an equidigital number, since it uses as much as digits as its factorization.

381818818193 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2654208, while the sum is 59.

The spelling of 381818818193 in words is "three hundred eighty-one billion, eight hundred eighteen million, eight hundred eighteen thousand, one hundred ninety-three".