321680161 has 8 divisors (see below), whose sum is σ = 357545664. Its totient is φ = 286918320.

The previous prime is 321680159. The next prime is 321680189. The reversal of 321680161 is 161086123.

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

It is a cyclic number.

It is not a de Polignac number, because 321680161 - 2¹ = 321680159 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (321680101) 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 7 ways as a sum of consecutive naturals, for example, 275301 + ... + 276466.

It is an arithmetic number, because the mean of its divisors is an integer number (44693208).

Almost surely, 2^321680161 is an apocalyptic number.

It is an amenable number.

321680161 is a deficient number, since it is larger than the sum of its proper divisors (35865503).

321680161 is a wasteful number, since it uses less digits than its factorization.

321680161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 551831.

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 321680161 is about 17935.4442654761. Note that the first 3 decimals coincide. The cubic root of 321680161 is about 685.1853875122.

The spelling of 321680161 in words is "three hundred twenty-one million, six hundred eighty thousand, one hundred sixty-one".