320808161 has 8 divisors (see below), whose sum is σ = 323242920. Its totient is φ = 318382848.

The previous prime is 320808143. The next prime is 320808199. The reversal of 320808161 is 161808023.

It can be written as a sum of positive squares in 4 ways, for example, as 76667536 + 244140625 = 8756^2 + 15625^2 .

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 320808161 - 2¹⁴ = 320791777 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (320808361) 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, 75095 + ... + 79251.

It is an arithmetic number, because the mean of its divisors is an integer number (40405365).

Almost surely, 2^320808161 is an apocalyptic number.

It is an amenable number.

320808161 is a deficient number, since it is larger than the sum of its proper divisors (2434759).

320808161 is a wasteful number, since it uses less digits than its factorization.

320808161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4723.

The product of its (nonzero) digits is 2304, while the sum is 29.

The square root of 320808161 is about 17911.1183626260. The cubic root of 320808161 is about 684.5657012288.

The spelling of 320808161 in words is "three hundred twenty million, eight hundred eight thousand, one hundred sixty-one".