1315645505969 has 2 divisors, whose sum is σ = 1315645505970. Its totient is φ = 1315645505968.

The previous prime is 1315645505957. The next prime is 1315645505971. The reversal of 1315645505969 is 9695055465131.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 921431047744 + 394214458225 = 959912^2 + 627865^2 .

It is a cyclic number.

It is not a de Polignac number, because 1315645505969 - 2⁴ = 1315645505953 is a prime.

It is a super-2 number, since 2×1315645505969² (a number of 25 digits) contains 22 as substring.

It is a Sophie Germain prime.

Together with 1315645505971, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (1315645505269) 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, 657822752984 + 657822752985.

It is an arithmetic number, because the mean of its divisors is an integer number (657822752985).

Almost surely, 2^{1315645505969} is an apocalyptic number.

It is an amenable number.

1315645505969 is a deficient number, since it is larger than the sum of its proper divisors (1).

1315645505969 is an equidigital number, since it uses as much as digits as its factorization.

1315645505969 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 21870000, while the sum is 59.

The spelling of 1315645505969 in words is "one trillion, three hundred fifteen billion, six hundred forty-five million, five hundred five thousand, nine hundred sixty-nine".