1380170831549 has 2 divisors, whose sum is σ = 1380170831550. Its totient is φ = 1380170831548.

The previous prime is 1380170831521. The next prime is 1380170831623. The reversal of 1380170831549 is 9451380710831.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 981387422500 + 398783409049 = 990650^2 + 631493^2 .

It is a cyclic number.

It is not a de Polignac number, because 1380170831549 - 2²⁴ = 1380154054333 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 = 1380170831497 and 1380170831506.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1380170831509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 690085415774 + 690085415775.

It is an arithmetic number, because the mean of its divisors is an integer number (690085415775).

Almost surely, 2^{1380170831549} is an apocalyptic number.

It is an amenable number.

1380170831549 is a deficient number, since it is larger than the sum of its proper divisors (1).

1380170831549 is an equidigital number, since it uses as much as digits as its factorization.

1380170831549 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 725760, while the sum is 50.

The spelling of 1380170831549 in words is "one trillion, three hundred eighty billion, one hundred seventy million, eight hundred thirty-one thousand, five hundred forty-nine".