1317432757 has 4 divisors (see below), whose sum is σ = 1331014636. Its totient is φ = 1303850880.

The previous prime is 1317432749. The next prime is 1317432797. The reversal of 1317432757 is 7572347131.

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 929579121 + 387853636 = 30489^2 + 19694^2 .

It is a cyclic number.

It is not a de Polignac number, because 1317432757 - 2³ = 1317432749 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 (1317432797) 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 in 3 ways as a sum of consecutive naturals, for example, 6790794 + ... + 6790987.

It is an arithmetic number, because the mean of its divisors is an integer number (332753659).

Almost surely, 2^1317432757 is an apocalyptic number.

It is an amenable number.

1317432757 is a deficient number, since it is larger than the sum of its proper divisors (13581879).

1317432757 is an equidigital number, since it uses as much as digits as its factorization.

1317432757 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13581878.

The product of its digits is 123480, while the sum is 40.

The square root of 1317432757 is about 36296.4565350393. The cubic root of 1317432757 is about 1096.2496958593.

Adding to 1317432757 its reverse (7572347131), we get a palindrome (8889779888).

The spelling of 1317432757 in words is "one billion, three hundred seventeen million, four hundred thirty-two thousand, seven hundred fifty-seven".