9819384382081 has 4 divisors (see below), whose sum is σ = 9826931950164. Its totient is φ = 9811836814000.

The previous prime is 9819384382063. The next prime is 9819384382169. The reversal of 9819384382081 is 1802834839189.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1943974890225 + 7875409491856 = 1394265^2 + 2806316^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9819384382081 is a prime.

It is a super-2 number, since 2×9819384382081² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9819384382481) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3773782090 + ... + 3773784691.

It is an arithmetic number, because the mean of its divisors is an integer number (2456732987541).

Almost surely, 2^{9819384382081} is an apocalyptic number.

It is an amenable number.

9819384382081 is a deficient number, since it is larger than the sum of its proper divisors (7547568083).

9819384382081 is a wasteful number, since it uses less digits than its factorization.

9819384382081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7547568082.

The product of its (nonzero) digits is 23887872, while the sum is 64.

The spelling of 9819384382081 in words is "nine trillion, eight hundred nineteen billion, three hundred eighty-four million, three hundred eighty-two thousand, eighty-one".