1305718409 has 2 divisors, whose sum is σ = 1305718410. Its totient is φ = 1305718408.

The previous prime is 1305718397. The next prime is 1305718411. The reversal of 1305718409 is 9048175031.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1080568384 + 225150025 = 32872^2 + 15005^2 .

It is a cyclic number.

It is not a de Polignac number, because 1305718409 - 2²⁰ = 1304669833 is a prime.

Together with 1305718411, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1305718459) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 652859204 + 652859205.

It is an arithmetic number, because the mean of its divisors is an integer number (652859205).

Almost surely, 2^1305718409 is an apocalyptic number.

It is an amenable number.

1305718409 is a deficient number, since it is larger than the sum of its proper divisors (1).

1305718409 is an equidigital number, since it uses as much as digits as its factorization.

1305718409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 30240, while the sum is 38.

The square root of 1305718409 is about 36134.7258049650. The cubic root of 1305718409 is about 1092.9908067064.

The spelling of 1305718409 in words is "one billion, three hundred five million, seven hundred eighteen thousand, four hundred nine".