1306486561 has 2 divisors, whose sum is σ = 1306486562. Its totient is φ = 1306486560.

The previous prime is 1306486553. The next prime is 1306486583. The reversal of 1306486561 is 1656846031.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1304582161 + 1904400 = 36119^2 + 1380^2 .

It is an emirp because it is prime and its reverse (1656846031) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1306486561 - 2³ = 1306486553 is a prime.

It is not a weakly prime, because it can be changed into another prime (1306486061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 653243280 + 653243281.

It is an arithmetic number, because the mean of its divisors is an integer number (653243281).

Almost surely, 2^1306486561 is an apocalyptic number.

It is an amenable number.

1306486561 is a deficient number, since it is larger than the sum of its proper divisors (1).

1306486561 is an equidigital number, since it uses as much as digits as its factorization.

1306486561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 103680, while the sum is 40.

The square root of 1306486561 is about 36145.3532421527. The cubic root of 1306486561 is about 1093.2050995892.

The spelling of 1306486561 in words is "one billion, three hundred six million, four hundred eighty-six thousand, five hundred sixty-one".