320531225 has 24 divisors (see below), whose sum is σ = 455292288. Its totient is φ = 219283200.

The previous prime is 320531221. The next prime is 320531249. The reversal of 320531225 is 522135023.

320531225 is nontrivially palindromic in base 2.

It is not a de Polignac number, because 320531225 - 2² = 320531221 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 320531225.

It is not an unprimeable number, because it can be changed into a prime (320531221) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 83345 + ... + 87105.

It is an arithmetic number, because the mean of its divisors is an integer number (18970512).

Almost surely, 2^320531225 is an apocalyptic number.

320531225 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

It is an amenable number.

320531225 is a deficient number, since it is larger than the sum of its proper divisors (134761063).

320531225 is a wasteful number, since it uses less digits than its factorization.

320531225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4265 (or 4260 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 23.

The square root of 320531225 is about 17903.3858529609. The cubic root of 320531225 is about 684.3686619097.

Adding to 320531225 its reverse (522135023), we get a palindrome (842666248).

The spelling of 320531225 in words is "three hundred twenty million, five hundred thirty-one thousand, two hundred twenty-five".