1315645997 has 4 divisors (see below), whose sum is σ = 1393036956. Its totient is φ = 1238255040.

The previous prime is 1315645993. The next prime is 1315646021. The reversal of 1315645997 is 7995465131.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 521026276 + 794619721 = 22826^2 + 28189^2 .

It is a cyclic number.

It is not a de Polignac number, because 1315645997 - 2² = 1315645993 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1315645993) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 38695454 + ... + 38695487.

It is an arithmetic number, because the mean of its divisors is an integer number (348259239).

Almost surely, 2^1315645997 is an apocalyptic number.

1315645997 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

1315645997 is a deficient number, since it is larger than the sum of its proper divisors (77390959).

1315645997 is an equidigital number, since it uses as much as digits as its factorization.

1315645997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77390958.

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

The square root of 1315645997 is about 36271.8347619748. The cubic root of 1315645997 is about 1095.7538776929.

The spelling of 1315645997 in words is "one billion, three hundred fifteen million, six hundred forty-five thousand, nine hundred ninety-seven".