1315691779 has 2 divisors, whose sum is σ = 1315691780. Its totient is φ = 1315691778.

The previous prime is 1315691743. The next prime is 1315691789. The reversal of 1315691779 is 9771965131.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1315691779 - 2¹⁵ = 1315659011 is a prime.

It is not a weakly prime, because it can be changed into another prime (1315691789) 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, 657845889 + 657845890.

It is an arithmetic number, because the mean of its divisors is an integer number (657845890).

Almost surely, 2^1315691779 is an apocalyptic number.

1315691779 is a deficient number, since it is larger than the sum of its proper divisors (1).

1315691779 is an equidigital number, since it uses as much as digits as its factorization.

1315691779 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 357210, while the sum is 49.

The square root of 1315691779 is about 36272.4658522136. The cubic root of 1315691779 is about 1095.7665876018.

The spelling of 1315691779 in words is "one billion, three hundred fifteen million, six hundred ninety-one thousand, seven hundred seventy-nine".