320533261 has 4 divisors (see below), whose sum is σ = 320818300. Its totient is φ = 320248224.

The previous prime is 320533243. The next prime is 320533271. The reversal of 320533261 is 162335023.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 162335023 = 17 ⋅9549119.

It can be written as a sum of positive squares in 2 ways, for example, as 39300361 + 281232900 = 6269^2 + 16770^2 .

It is a cyclic number.

It is not a de Polignac number, because 320533261 - 2¹¹ = 320531213 is a prime.

It is a super-3 number, since 3×320533261³ (a number of 26 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (320533271) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 140826 + ... + 143083.

It is an arithmetic number, because the mean of its divisors is an integer number (80204575).

Almost surely, 2^320533261 is an apocalyptic number.

It is an amenable number.

320533261 is a deficient number, since it is larger than the sum of its proper divisors (285039).

320533261 is a wasteful number, since it uses less digits than its factorization.

320533261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 285038.

The product of its (nonzero) digits is 3240, while the sum is 25.

The square root of 320533261 is about 17903.4427136235. The cubic root of 320533261 is about 684.3701109330.

Adding to 320533261 its reverse (162335023), we get a palindrome (482868284).

The spelling of 320533261 in words is "three hundred twenty million, five hundred thirty-three thousand, two hundred sixty-one".