318540641 has 4 divisors (see below), whose sum is σ = 318833172. Its totient is φ = 318248112.

The previous prime is 318540617. The next prime is 318540661. The reversal of 318540641 is 146045813.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 146045813 = 41 ⋅3562093.

It can be written as a sum of positive squares in 2 ways, for example, as 257763025 + 60777616 = 16055^2 + 7796^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-318540641 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 318540598 and 318540607.

It is not an unprimeable number, because it can be changed into a prime (318540661) 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, 144626 + ... + 146811.

It is an arithmetic number, because the mean of its divisors is an integer number (79708293).

Almost surely, 2^318540641 is an apocalyptic number.

It is an amenable number.

318540641 is a deficient number, since it is larger than the sum of its proper divisors (292531).

318540641 is a wasteful number, since it uses less digits than its factorization.

318540641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 292530.

The product of its (nonzero) digits is 11520, while the sum is 32.

The square root of 318540641 is about 17847.7068835187. The cubic root of 318540641 is about 682.9490153565.

The spelling of 318540641 in words is "three hundred eighteen million, five hundred forty thousand, six hundred forty-one".