316809985 has 8 divisors (see below), whose sum is σ = 381263400. Its totient is φ = 252720384.

The previous prime is 316809979. The next prime is 316809989. The reversal of 316809985 is 589908613.

It can be written as a sum of positive squares in 4 ways, for example, as 55890576 + 260919409 = 7476^2 + 16153^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-316809985 is a prime.

It is not an unprimeable number, because it can be changed into a prime (316809989) 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, 89032 + ... + 92521.

It is an arithmetic number, because the mean of its divisors is an integer number (47657925).

Almost surely, 2^316809985 is an apocalyptic number.

It is an amenable number.

316809985 is a deficient number, since it is larger than the sum of its proper divisors (64453415).

316809985 is a wasteful number, since it uses less digits than its factorization.

316809985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 181907.

The product of its (nonzero) digits is 466560, while the sum is 49.

The square root of 316809985 is about 17799.1568620539. The cubic root of 316809985 is about 681.7099303075.

The spelling of 316809985 in words is "three hundred sixteen million, eight hundred nine thousand, nine hundred eighty-five".