1315915771 has 2 divisors, whose sum is σ = 1315915772. Its totient is φ = 1315915770.

The previous prime is 1315915723. The next prime is 1315915847. The reversal of 1315915771 is 1775195131.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1315915771 is a prime.

It is not a weakly prime, because it can be changed into another prime (1315913771) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 657957885 + 657957886.

It is an arithmetic number, because the mean of its divisors is an integer number (657957886).

Almost surely, 2^1315915771 is an apocalyptic number.

1315915771 is a deficient number, since it is larger than the sum of its proper divisors (1).

1315915771 is an equidigital number, since it uses as much as digits as its factorization.

1315915771 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 33075, while the sum is 40.

The square root of 1315915771 is about 36275.5533520855. The cubic root of 1315915771 is about 1095.8287675708.

The spelling of 1315915771 in words is "one billion, three hundred fifteen million, nine hundred fifteen thousand, seven hundred seventy-one".