389198309657 has 2 divisors, whose sum is σ = 389198309658. Its totient is φ = 389198309656.

The previous prime is 389198309629. The next prime is 389198309681. The reversal of 389198309657 is 756903891983.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 336288649216 + 52909660441 = 579904^2 + 230021^2 .

It is an emirp because it is prime and its reverse (756903891983) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 389198309657 - 2¹⁴ = 389198293273 is a prime.

It is not a weakly prime, because it can be changed into another prime (389198302657) 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, 194599154828 + 194599154829.

It is an arithmetic number, because the mean of its divisors is an integer number (194599154829).

Almost surely, 2^389198309657 is an apocalyptic number.

It is an amenable number.

389198309657 is a deficient number, since it is larger than the sum of its proper divisors (1).

389198309657 is an equidigital number, since it uses as much as digits as its factorization.

389198309657 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 88179840, while the sum is 68.

The spelling of 389198309657 in words is "three hundred eighty-nine billion, one hundred ninety-eight million, three hundred nine thousand, six hundred fifty-seven".