318231985 has 8 divisors (see below), whose sum is σ = 382001256. Its totient is φ = 254503680.

The previous prime is 318231973. The next prime is 318231989. The reversal of 318231985 is 589132813.

It can be written as a sum of positive squares in 4 ways, for example, as 199487376 + 118744609 = 14124^2 + 10897^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 318231985 - 2¹⁹ = 317707697 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (318231989) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10777 + ... + 27433.

It is an arithmetic number, because the mean of its divisors is an integer number (47750157).

Almost surely, 2^318231985 is an apocalyptic number.

It is an amenable number.

318231985 is a deficient number, since it is larger than the sum of its proper divisors (63769271).

318231985 is a wasteful number, since it uses less digits than its factorization.

318231985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20483.

The product of its digits is 51840, while the sum is 40.

The square root of 318231985 is about 17839.0578506826. The cubic root of 318231985 is about 682.7283586010.

The spelling of 318231985 in words is "three hundred eighteen million, two hundred thirty-one thousand, nine hundred eighty-five".