316505945 has 12 divisors (see below), whose sum is σ = 441816804. Its totient is φ = 217032480.

The previous prime is 316505899. The next prime is 316505947. The reversal of 316505945 is 549505613.

It can be written as a sum of positive squares in 2 ways, for example, as 63568729 + 252937216 = 7973^2 + 15904^2 .

It is not a de Polignac number, because 316505945 - 2⁸ = 316505689 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 316505899 and 316505908.

It is not an unprimeable number, because it can be changed into a prime (316505947) 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 11 ways as a sum of consecutive naturals, for example, 645686 + ... + 646175.

It is an arithmetic number, because the mean of its divisors is an integer number (36818067).

Almost surely, 2^316505945 is an apocalyptic number.

316505945 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

It is an amenable number.

316505945 is a deficient number, since it is larger than the sum of its proper divisors (125310859).

316505945 is a wasteful number, since it uses less digits than its factorization.

316505945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1291880 (or 1291873 counting only the distinct ones).

The product of its (nonzero) digits is 81000, while the sum is 38.

The square root of 316505945 is about 17790.6139579274. The cubic root of 316505945 is about 681.4917833250.

The spelling of 316505945 in words is "three hundred sixteen million, five hundred five thousand, nine hundred forty-five".