1306320761 has 2 divisors, whose sum is σ = 1306320762. Its totient is φ = 1306320760.

The previous prime is 1306320727. The next prime is 1306320797. The reversal of 1306320761 is 1670236031.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 769008361 + 537312400 = 27731^2 + 23180^2 .

It is an emirp because it is prime and its reverse (1670236031) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1306320761 is a prime.

It is not a weakly prime, because it can be changed into another prime (1306320061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 653160380 + 653160381.

It is an arithmetic number, because the mean of its divisors is an integer number (653160381).

Almost surely, 2^1306320761 is an apocalyptic number.

It is an amenable number.

1306320761 is a deficient number, since it is larger than the sum of its proper divisors (1).

1306320761 is an equidigital number, since it uses as much as digits as its factorization.

1306320761 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4536, while the sum is 29.

The square root of 1306320761 is about 36143.0596518889. The cubic root of 1306320761 is about 1093.1588531451.

Adding to 1306320761 its reverse (1670236031), we get a palindrome (2976556792).

The spelling of 1306320761 in words is "one billion, three hundred six million, three hundred twenty thousand, seven hundred sixty-one".