389198309681 has 2 divisors, whose sum is σ = 389198309682. Its totient is φ = 389198309680.

The previous prime is 389198309657. The next prime is 389198309719. The reversal of 389198309681 is 186903891983.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 377315347600 + 11882962081 = 614260^2 + 109009^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-389198309681 is a prime.

It is a super-2 number, since 2×389198309681² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (389198509681) 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, 194599154840 + 194599154841.

It is an arithmetic number, because the mean of its divisors is an integer number (194599154841).

Almost surely, 2^389198309681 is an apocalyptic number.

It is an amenable number.

389198309681 is a deficient number, since it is larger than the sum of its proper divisors (1).

389198309681 is an equidigital number, since it uses as much as digits as its factorization.

389198309681 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20155392, while the sum is 65.

The spelling of 389198309681 in words is "three hundred eighty-nine billion, one hundred ninety-eight million, three hundred nine thousand, six hundred eighty-one".