320949985 has 4 divisors (see below), whose sum is σ = 385139988. Its totient is φ = 256759984.

The previous prime is 320949971. The next prime is 320949997. The reversal of 320949985 is 589949023.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 589949023 = 4703 ⋅125441.

It can be written as a sum of positive squares in 2 ways, for example, as 75620416 + 245329569 = 8696^2 + 15663^2 .

It is a cyclic number.

It is not a de Polignac number, because 320949985 - 2⁷ = 320949857 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32094994 + ... + 32095003.

It is an arithmetic number, because the mean of its divisors is an integer number (96284997).

Almost surely, 2^320949985 is an apocalyptic number.

It is an amenable number.

320949985 is a deficient number, since it is larger than the sum of its proper divisors (64190003).

320949985 is an equidigital number, since it uses as much as digits as its factorization.

320949985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64190002.

The product of its (nonzero) digits is 699840, while the sum is 49.

The square root of 320949985 is about 17915.0770302558. The cubic root of 320949985 is about 684.6665647711. Note that the first 3 decimals are identical.

The spelling of 320949985 in words is "three hundred twenty million, nine hundred forty-nine thousand, nine hundred eighty-five".