1306753561 has 2 divisors, whose sum is σ = 1306753562. Its totient is φ = 1306753560.

The previous prime is 1306753541. The next prime is 1306753607. The reversal of 1306753561 is 1653576031.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1034008336 + 272745225 = 32156^2 + 16515^2 .

It is a cyclic number.

It is not a de Polignac number, because 1306753561 - 2²⁵ = 1273199129 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1306753561.

It is not a weakly prime, because it can be changed into another prime (1306753541) 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, 653376780 + 653376781.

It is an arithmetic number, because the mean of its divisors is an integer number (653376781).

Almost surely, 2^1306753561 is an apocalyptic number.

It is an amenable number.

1306753561 is a deficient number, since it is larger than the sum of its proper divisors (1).

1306753561 is an equidigital number, since it uses as much as digits as its factorization.

1306753561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 56700, while the sum is 37.

The square root of 1306753561 is about 36149.0464742848. The cubic root of 1306753561 is about 1093.2795654350.

The spelling of 1306753561 in words is "one billion, three hundred six million, seven hundred fifty-three thousand, five hundred sixty-one".