320411261 has 2 divisors, whose sum is σ = 320411262. Its totient is φ = 320411260.

The previous prime is 320411251. The next prime is 320411309. The reversal of 320411261 is 162114023.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 207648100 + 112763161 = 14410^2 + 10619^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-320411261 is a prime.

It is a super-2 number, since 2×320411261² = 205326752351220242, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (320411251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160205630 + 160205631.

It is an arithmetic number, because the mean of its divisors is an integer number (160205631).

Almost surely, 2^320411261 is an apocalyptic number.

It is an amenable number.

320411261 is a deficient number, since it is larger than the sum of its proper divisors (1).

320411261 is an equidigital number, since it uses as much as digits as its factorization.

320411261 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 320411261 is about 17900.0352234290. The cubic root of 320411261 is about 684.2832725724.

Adding to 320411261 its reverse (162114023), we get a palindrome (482525284).

The spelling of 320411261 in words is "three hundred twenty million, four hundred eleven thousand, two hundred sixty-one".