1281460680581 has 2 divisors, whose sum is σ = 1281460680582. Its totient is φ = 1281460680580.

The previous prime is 1281460680529. The next prime is 1281460680587. The reversal of 1281460680581 is 1850860641821.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 962733816100 + 318726864481 = 981190^2 + 564559^2 .

It is an emirp because it is prime and its reverse (1850860641821) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1281460680581 - 2¹⁰ = 1281460679557 is a prime.

It is a super-2 number, since 2×1281460680581² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1281460680587) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 640730340290 + 640730340291.

It is an arithmetic number, because the mean of its divisors is an integer number (640730340291).

Almost surely, 2^{1281460680581} is an apocalyptic number.

It is an amenable number.

1281460680581 is a deficient number, since it is larger than the sum of its proper divisors (1).

1281460680581 is an equidigital number, since it uses as much as digits as its factorization.

1281460680581 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 737280, while the sum is 50.

The spelling of 1281460680581 in words is "one trillion, two hundred eighty-one billion, four hundred sixty million, six hundred eighty thousand, five hundred eighty-one".