281982756961 has 2 divisors, whose sum is σ = 281982756962. Its totient is φ = 281982756960.

The previous prime is 281982756901. The next prime is 281982756971. The reversal of 281982756961 is 169657289182.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 276170219361 + 5812537600 = 525519^2 + 76240^2 .

It is a cyclic number.

It is not a de Polignac number, because 281982756961 - 2¹⁹ = 281982232673 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 281982756893 and 281982756902.

It is not a weakly prime, because it can be changed into another prime (281982756901) 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 as a sum of consecutive naturals, namely, 140991378480 + 140991378481.

It is an arithmetic number, because the mean of its divisors is an integer number (140991378481).

Almost surely, 2^281982756961 is an apocalyptic number.

It is an amenable number.

281982756961 is a deficient number, since it is larger than the sum of its proper divisors (1).

281982756961 is an equidigital number, since it uses as much as digits as its factorization.

281982756961 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 26127360, while the sum is 64.

The spelling of 281982756961 in words is "two hundred eighty-one billion, nine hundred eighty-two million, seven hundred fifty-six thousand, nine hundred sixty-one".