1315685977 has 2 divisors, whose sum is σ = 1315685978. Its totient is φ = 1315685976.

The previous prime is 1315685963. The next prime is 1315685983. The reversal of 1315685977 is 7795865131.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 945931536 + 369754441 = 30756^2 + 19229^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1315685977 is a prime.

It is not a weakly prime, because it can be changed into another prime (1315685927) 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, 657842988 + 657842989.

It is an arithmetic number, because the mean of its divisors is an integer number (657842989).

Almost surely, 2^1315685977 is an apocalyptic number.

It is an amenable number.

1315685977 is a deficient number, since it is larger than the sum of its proper divisors (1).

1315685977 is an equidigital number, since it uses as much as digits as its factorization.

1315685977 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1587600, while the sum is 52.

The square root of 1315685977 is about 36272.3858741054. The cubic root of 1315685977 is about 1095.7649768783.

The spelling of 1315685977 in words is "one billion, three hundred fifteen million, six hundred eighty-five thousand, nine hundred seventy-seven".