1389129255361 has 4 divisors (see below), whose sum is σ = 1389284839300. Its totient is φ = 1388973671424.

The previous prime is 1389129255301. The next prime is 1389129255379. The reversal of 1389129255361 is 1635529219831.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 405967768336 + 983161487025 = 637156^2 + 991545^2 .

It is a cyclic number.

It is not a de Polignac number, because 1389129255361 - 2¹⁷ = 1389129124289 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1389129255301) 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 in 3 ways as a sum of consecutive naturals, for example, 77778576 + ... + 77796433.

It is an arithmetic number, because the mean of its divisors is an integer number (347321209825).

Almost surely, 2^{1389129255361} is an apocalyptic number.

It is an amenable number.

1389129255361 is a deficient number, since it is larger than the sum of its proper divisors (155583939).

1389129255361 is an equidigital number, since it uses as much as digits as its factorization.

1389129255361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155583938.

The product of its digits is 3499200, while the sum is 55.

The spelling of 1389129255361 in words is "one trillion, three hundred eighty-nine billion, one hundred twenty-nine million, two hundred fifty-five thousand, three hundred sixty-one".