1283881814561 has 4 divisors (see below), whose sum is σ = 1328153601300. Its totient is φ = 1239610027824.

The previous prime is 1283881814491. The next prime is 1283881814569. The reversal of 1283881814561 is 1654181883821.

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 883628200225 + 400253614336 = 940015^2 + 632656^2 .

It is a cyclic number.

It is not a de Polignac number, because 1283881814561 - 2¹⁸ = 1283881552417 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1283881814497 and 1283881814506.

It is not an unprimeable number, because it can be changed into a prime (1283881814569) 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, 22135893326 + ... + 22135893383.

It is an arithmetic number, because the mean of its divisors is an integer number (332038400325).

Almost surely, 2^{1283881814561} is an apocalyptic number.

It is an amenable number.

1283881814561 is a deficient number, since it is larger than the sum of its proper divisors (44271786739).

1283881814561 is an equidigital number, since it uses as much as digits as its factorization.

1283881814561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44271786738.

The product of its digits is 2949120, while the sum is 56.

The spelling of 1283881814561 in words is "one trillion, two hundred eighty-three billion, eight hundred eighty-one million, eight hundred fourteen thousand, five hundred sixty-one".