1316505761 has 2 divisors, whose sum is σ = 1316505762. Its totient is φ = 1316505760.

The previous prime is 1316505739. The next prime is 1316505781. The reversal of 1316505761 is 1675056131.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 811110400 + 505395361 = 28480^2 + 22481^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1316505761 is a prime.

It is not a weakly prime, because it can be changed into another prime (1316505781) 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, 658252880 + 658252881.

It is an arithmetic number, because the mean of its divisors is an integer number (658252881).

Almost surely, 2^1316505761 is an apocalyptic number.

It is an amenable number.

1316505761 is a deficient number, since it is larger than the sum of its proper divisors (1).

1316505761 is an equidigital number, since it uses as much as digits as its factorization.

1316505761 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18900, while the sum is 35.

The square root of 1316505761 is about 36283.6845014395. The cubic root of 1316505761 is about 1095.9925144786.

The spelling of 1316505761 in words is "one billion, three hundred sixteen million, five hundred five thousand, seven hundred sixty-one".