320330261 has 2 divisors, whose sum is σ = 320330262. Its totient is φ = 320330260.

The previous prime is 320330237. The next prime is 320330267. The reversal of 320330261 is 162033023.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 316306225 + 4024036 = 17785^2 + 2006^2 .

It is an emirp because it is prime and its reverse (162033023) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 320330261 - 2¹⁰ = 320329237 is a prime.

It is a super-2 number, since 2×320330261² = 205222952224656242, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (320330267) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160165130 + 160165131.

It is an arithmetic number, because the mean of its divisors is an integer number (160165131).

Almost surely, 2^320330261 is an apocalyptic number.

It is an amenable number.

320330261 is a deficient number, since it is larger than the sum of its proper divisors (1).

320330261 is an equidigital number, since it uses as much as digits as its factorization.

320330261 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 648, while the sum is 20.

The square root of 320330261 is about 17897.7725150366. The cubic root of 320330261 is about 684.2256054186.

Adding to 320330261 its reverse (162033023), we get a palindrome (482363284).

The spelling of 320330261 in words is "three hundred twenty million, three hundred thirty thousand, two hundred sixty-one".