38963818981 has 2 divisors, whose sum is σ = 38963818982. Its totient is φ = 38963818980.

The previous prime is 38963818973. The next prime is 38963819039. The reversal of 38963818981 is 18981836983.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 23406246081 + 15557572900 = 152991^2 + 124730^2 .

It is a cyclic number.

It is not a de Polignac number, because 38963818981 - 2³ = 38963818973 is a prime.

It is a super-2 number, since 2×38963818981² (a number of 22 digits) contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (38963818781) 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 as a sum of consecutive naturals, namely, 19481909490 + 19481909491.

It is an arithmetic number, because the mean of its divisors is an integer number (19481909491).

Almost surely, 2^38963818981 is an apocalyptic number.

It is an amenable number.

38963818981 is a deficient number, since it is larger than the sum of its proper divisors (1).

38963818981 is an equidigital number, since it uses as much as digits as its factorization.

38963818981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 17915904, while the sum is 64.

The spelling of 38963818981 in words is "thirty-eight billion, nine hundred sixty-three million, eight hundred eighteen thousand, nine hundred eighty-one".