1315945769 has 2 divisors, whose sum is σ = 1315945770. Its totient is φ = 1315945768.

The previous prime is 1315945693. The next prime is 1315945783. The reversal of 1315945769 is 9675495131.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1296936169 + 19009600 = 36013^2 + 4360^2 .

It is an emirp because it is prime and its reverse (9675495131) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1315945769 is a prime.

It is a super-2 number, since 2×1315945769² = 3463426533898002722, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (1315947769) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 657972884 + 657972885.

It is an arithmetic number, because the mean of its divisors is an integer number (657972885).

Almost surely, 2^1315945769 is an apocalyptic number.

It is an amenable number.

1315945769 is a deficient number, since it is larger than the sum of its proper divisors (1).

1315945769 is an equidigital number, since it uses as much as digits as its factorization.

1315945769 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1020600, while the sum is 50.

The square root of 1315945769 is about 36275.9668237802. The cubic root of 1315945769 is about 1095.8370944517.

The spelling of 1315945769 in words is "one billion, three hundred fifteen million, nine hundred forty-five thousand, seven hundred sixty-nine".