320164261 has 2 divisors, whose sum is σ = 320164262. Its totient is φ = 320164260.

The previous prime is 320164253. The next prime is 320164277. The reversal of 320164261 is 162461023.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 186322500 + 133841761 = 13650^2 + 11569^2 .

It is a cyclic number.

It is not a de Polignac number, because 320164261 - 2³ = 320164253 is a prime.

It is a super-3 number, since 3×320164261³ (a number of 26 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (320164211) 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 as a sum of consecutive naturals, namely, 160082130 + 160082131.

It is an arithmetic number, because the mean of its divisors is an integer number (160082131).

Almost surely, 2^320164261 is an apocalyptic number.

It is an amenable number.

320164261 is a deficient number, since it is larger than the sum of its proper divisors (1).

320164261 is an equidigital number, since it uses as much as digits as its factorization.

320164261 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1728, while the sum is 25.

The square root of 320164261 is about 17893.1344654870. The cubic root of 320164261 is about 684.1073929674.

The spelling of 320164261 in words is "three hundred twenty million, one hundred sixty-four thousand, two hundred sixty-one".