318856532381 has 4 divisors (see below), whose sum is σ = 319416913500. Its totient is φ = 318296151264.

The previous prime is 318856532377. The next prime is 318856532411. The reversal of 318856532381 is 183235658813.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 183235658813 = 43 ⋅4261294391.

It can be written as a sum of positive squares in 2 ways, for example, as 81619347481 + 237237184900 = 285691^2 + 487070^2 .

It is a cyclic number.

It is not a de Polignac number, because 318856532381 - 2² = 318856532377 is a prime.

It is a super-2 number, since 2×318856532381² (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 (318856532341) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 280189706 + ... + 280190843.

It is an arithmetic number, because the mean of its divisors is an integer number (79854228375).

Almost surely, 2^318856532381 is an apocalyptic number.

It is an amenable number.

318856532381 is a deficient number, since it is larger than the sum of its proper divisors (560381119).

318856532381 is an equidigital number, since it uses as much as digits as its factorization.

318856532381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 560381118.

The product of its digits is 4147200, while the sum is 53.

The spelling of 318856532381 in words is "three hundred eighteen billion, eight hundred fifty-six million, five hundred thirty-two thousand, three hundred eighty-one".