1315897777 has 2 divisors, whose sum is σ = 1315897778. Its totient is φ = 1315897776.

The previous prime is 1315897771. The next prime is 1315897789. The reversal of 1315897777 is 7777985131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 728514081 + 587383696 = 26991^2 + 24236^2 .

It is a cyclic number.

It is not a de Polignac number, because 1315897777 - 2¹⁵ = 1315865009 is a prime.

It is not a weakly prime, because it can be changed into another prime (1315897771) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 657948888 + 657948889.

It is an arithmetic number, because the mean of its divisors is an integer number (657948889).

Almost surely, 2^1315897777 is an apocalyptic number.

It is an amenable number.

1315897777 is a deficient number, since it is larger than the sum of its proper divisors (1).

1315897777 is an equidigital number, since it uses as much as digits as its factorization.

1315897777 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2593080, while the sum is 55.

The square root of 1315897777 is about 36275.3053329672. The cubic root of 1315897777 is about 1095.8237727140.

The spelling of 1315897777 in words is "one billion, three hundred fifteen million, eight hundred ninety-seven thousand, seven hundred seventy-seven".