1316505791 has 2 divisors, whose sum is σ = 1316505792. Its totient is φ = 1316505790.

The previous prime is 1316505781. The next prime is 1316505803. The reversal of 1316505791 is 1975056131.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1316505791 - 2¹⁸ = 1316243647 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1316505761) 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, 658252895 + 658252896.

It is an arithmetic number, because the mean of its divisors is an integer number (658252896).

Almost surely, 2^1316505791 is an apocalyptic number.

1316505791 is a deficient number, since it is larger than the sum of its proper divisors (1).

1316505791 is an equidigital number, since it uses as much as digits as its factorization.

1316505791 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 28350, while the sum is 38.

The square root of 1316505791 is about 36283.6849148484. The cubic root of 1316505791 is about 1095.9925228036.

The spelling of 1316505791 in words is "one billion, three hundred sixteen million, five hundred five thousand, seven hundred ninety-one".