318971320519 has 4 divisors (see below), whose sum is σ = 319410071344. Its totient is φ = 318532569696.

The previous prime is 318971320487. The next prime is 318971320567. The reversal of 318971320519 is 915023179813.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 915023179813 = 19 ⋅48159114727.

It is a cyclic number.

It is not a de Polignac number, because 318971320519 - 2⁵ = 318971320487 is a prime.

It is a super-2 number, since 2×318971320519² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (318971320219) 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, 219374322 + ... + 219375775.

It is an arithmetic number, because the mean of its divisors is an integer number (79852517836).

Almost surely, 2^318971320519 is an apocalyptic number.

318971320519 is a deficient number, since it is larger than the sum of its proper divisors (438750825).

318971320519 is an equidigital number, since it uses as much as digits as its factorization.

318971320519 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 438750824.

The product of its (nonzero) digits is 408240, while the sum is 49.

The spelling of 318971320519 in words is "three hundred eighteen billion, nine hundred seventy-one million, three hundred twenty thousand, five hundred nineteen".