321999985 has 4 divisors (see below), whose sum is σ = 386399988. Its totient is φ = 257599984.

The previous prime is 321999983. The next prime is 322000027. The reversal of 321999985 is 589999123.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 223831521 + 98168464 = 14961^2 + 9908^2 .

It is a cyclic number.

It is not a de Polignac number, because 321999985 - 2¹ = 321999983 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (321999983) by changing a digit.

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, 32199994 + ... + 32200003.

It is an arithmetic number, because the mean of its divisors is an integer number (96599997).

Almost surely, 2^321999985 is an apocalyptic number.

It is an amenable number.

321999985 is a deficient number, since it is larger than the sum of its proper divisors (64400003).

321999985 is an equidigital number, since it uses as much as digits as its factorization.

321999985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64400002.

The product of its digits is 1574640, while the sum is 55.

The square root of 321999985 is about 17944.3580269677. The cubic root of 321999985 is about 685.4123895402.

The spelling of 321999985 in words is "three hundred twenty-one million, nine hundred ninety-nine thousand, nine hundred eighty-five".