1356116561 has 2 divisors, whose sum is σ = 1356116562. Its totient is φ = 1356116560.

The previous prime is 1356116549. The next prime is 1356116579. The reversal of 1356116561 is 1656116531.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1230676561 + 125440000 = 35081^2 + 11200^2 .

It is an emirp because it is prime and its reverse (1656116531) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1356116561 - 2¹⁸ = 1355854417 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (1356116581) 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, 678058280 + 678058281.

It is an arithmetic number, because the mean of its divisors is an integer number (678058281).

Almost surely, 2^1356116561 is an apocalyptic number.

It is an amenable number.

1356116561 is a deficient number, since it is larger than the sum of its proper divisors (1).

1356116561 is an equidigital number, since it uses as much as digits as its factorization.

1356116561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 16200, while the sum is 35.

The square root of 1356116561 is about 36825.4879261633. The cubic root of 1356116561 is about 1106.8760908622.

The spelling of 1356116561 in words is "one billion, three hundred fifty-six million, one hundred sixteen thousand, five hundred sixty-one".