1317280561 has 2 divisors, whose sum is σ = 1317280562. Its totient is φ = 1317280560.

The previous prime is 1317280553. The next prime is 1317280571. The reversal of 1317280561 is 1650827131.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 850072336 + 467208225 = 29156^2 + 21615^2 .

It is a cyclic number.

It is not a de Polignac number, because 1317280561 - 2³ = 1317280553 is a prime.

It is not a weakly prime, because it can be changed into another prime (1317280571) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 658640280 + 658640281.

It is an arithmetic number, because the mean of its divisors is an integer number (658640281).

Almost surely, 2^1317280561 is an apocalyptic number.

It is an amenable number.

1317280561 is a deficient number, since it is larger than the sum of its proper divisors (1).

1317280561 is an equidigital number, since it uses as much as digits as its factorization.

1317280561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10080, while the sum is 34.

The square root of 1317280561 is about 36294.3599061893. The cubic root of 1317280561 is about 1096.2074796012.

The spelling of 1317280561 in words is "one billion, three hundred seventeen million, two hundred eighty thousand, five hundred sixty-one".