1521049665481 has 2 divisors, whose sum is σ = 1521049665482. Its totient is φ = 1521049665480.

The previous prime is 1521049665449. The next prime is 1521049665599. The reversal of 1521049665481 is 1845669401251.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 857737151881 + 663312513600 = 926141^2 + 814440^2 .

It is a cyclic number.

It is not a de Polignac number, because 1521049665481 - 2⁵ = 1521049665449 is a prime.

It is a super-2 number, since 2×1521049665481² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1521049669481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 760524832740 + 760524832741.

It is an arithmetic number, because the mean of its divisors is an integer number (760524832741).

Almost surely, 2^{1521049665481} is an apocalyptic number.

It is an amenable number.

1521049665481 is a deficient number, since it is larger than the sum of its proper divisors (1).

1521049665481 is an equidigital number, since it uses as much as digits as its factorization.

1521049665481 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2073600, while the sum is 52.

The spelling of 1521049665481 in words is "one trillion, five hundred twenty-one billion, forty-nine million, six hundred sixty-five thousand, four hundred eighty-one".