1317128507 has 4 divisors (see below), whose sum is σ = 1386451080. Its totient is φ = 1247805936.

The previous prime is 1317128503. The next prime is 1317128569. The reversal of 1317128507 is 7058217131.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 1317128507 - 2² = 1317128503 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1317128503) 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, 34661258 + ... + 34661295.

It is an arithmetic number, because the mean of its divisors is an integer number (346612770).

Almost surely, 2^1317128507 is an apocalyptic number.

1317128507 is a deficient number, since it is larger than the sum of its proper divisors (69322573).

1317128507 is an equidigital number, since it uses as much as digits as its factorization.

1317128507 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69322572.

The product of its (nonzero) digits is 11760, while the sum is 35.

The square root of 1317128507 is about 36292.2651125553. The cubic root of 1317128507 is about 1096.1652994839.

The spelling of 1317128507 in words is "one billion, three hundred seventeen million, one hundred twenty-eight thousand, five hundred seven".