1231385759321 has 2 divisors, whose sum is σ = 1231385759322. Its totient is φ = 1231385759320.

The previous prime is 1231385759299. The next prime is 1231385759353. The reversal of 1231385759321 is 1239575831321.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1230404503696 + 981255625 = 1109236^2 + 31325^2 .

It is an emirp because it is prime and its reverse (1239575831321) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1231385759321 - 2³⁴ = 1214205890137 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1231385759321.

It is not a weakly prime, because it can be changed into another prime (1231385759221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 615692879660 + 615692879661.

It is an arithmetic number, because the mean of its divisors is an integer number (615692879661).

Almost surely, 2^{1231385759321} is an apocalyptic number.

It is an amenable number.

1231385759321 is a deficient number, since it is larger than the sum of its proper divisors (1).

1231385759321 is an equidigital number, since it uses as much as digits as its factorization.

1231385759321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1360800, while the sum is 50.

The spelling of 1231385759321 in words is "one trillion, two hundred thirty-one billion, three hundred eighty-five million, seven hundred fifty-nine thousand, three hundred twenty-one".