1361628387521 has 2 divisors, whose sum is σ = 1361628387522. Its totient is φ = 1361628387520.

The previous prime is 1361628387463. The next prime is 1361628387583. The reversal of 1361628387521 is 1257838261631.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1110115104400 + 251513283121 = 1053620^2 + 501511^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1361628387521 is a prime.

It is not a weakly prime, because it can be changed into another prime (1361628287521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 680814193760 + 680814193761.

It is an arithmetic number, because the mean of its divisors is an integer number (680814193761).

Almost surely, 2^{1361628387521} is an apocalyptic number.

It is an amenable number.

1361628387521 is a deficient number, since it is larger than the sum of its proper divisors (1).

1361628387521 is an equidigital number, since it uses as much as digits as its factorization.

1361628387521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2903040, while the sum is 53.

The spelling of 1361628387521 in words is "one trillion, three hundred sixty-one billion, six hundred twenty-eight million, three hundred eighty-seven thousand, five hundred twenty-one".