1317815279 has 4 divisors (see below), whose sum is σ = 1437616680. Its totient is φ = 1198013880.

The previous prime is 1317815237. The next prime is 1317815287. The reversal of 1317815279 is 9725187131.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9725187131 = 11 ⋅884107921.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1317815279 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 (1317815179) 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, 59900684 + ... + 59900705.

It is an arithmetic number, because the mean of its divisors is an integer number (359404170).

Almost surely, 2^1317815279 is an apocalyptic number.

1317815279 is a deficient number, since it is larger than the sum of its proper divisors (119801401).

1317815279 is a wasteful number, since it uses less digits than its factorization.

1317815279 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 119801400.

The product of its digits is 105840, while the sum is 44.

The square root of 1317815279 is about 36301.7255650472. The cubic root of 1317815279 is about 1096.3557857894.

The spelling of 1317815279 in words is "one billion, three hundred seventeen million, eight hundred fifteen thousand, two hundred seventy-nine".