1389519340661 has 2 divisors, whose sum is σ = 1389519340662. Its totient is φ = 1389519340660.

The previous prime is 1389519340637. The next prime is 1389519340673. The reversal of 1389519340661 is 1660439159831.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 975966168100 + 413553172561 = 987910^2 + 643081^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1389519340661 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1389519340597 and 1389519340606.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1389519340681) 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, 694759670330 + 694759670331.

It is an arithmetic number, because the mean of its divisors is an integer number (694759670331).

Almost surely, 2^{1389519340661} is an apocalyptic number.

It is an amenable number.

1389519340661 is a deficient number, since it is larger than the sum of its proper divisors (1).

1389519340661 is an equidigital number, since it uses as much as digits as its factorization.

1389519340661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4199040, while the sum is 56.

The spelling of 1389519340661 in words is "one trillion, three hundred eighty-nine billion, five hundred nineteen million, three hundred forty thousand, six hundred sixty-one".