531204321 has 16 divisors (see below), whose sum is σ = 760503168. Its totient is φ = 328608000.

The previous prime is 531204277. The next prime is 531204347. The reversal of 531204321 is 123402135.

It is not a de Polignac number, because 531204321 - 2⁶ = 531204257 is a prime.

It is not an unprimeable number, because it can be changed into a prime (531204361) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 69730 + ... + 76971.

It is an arithmetic number, because the mean of its divisors is an integer number (47531448).

Almost surely, 2^531204321 is an apocalyptic number.

531204321 is a gapful number since it is divisible by the number (51) formed by its first and last digit.

It is an amenable number.

531204321 is a deficient number, since it is larger than the sum of its proper divisors (229298847).

531204321 is a wasteful number, since it uses less digits than its factorization.

531204321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 146792.

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 531204321 is about 23047.8702052923. The cubic root of 531204321 is about 809.8797367556.

Adding to 531204321 its reverse (123402135), we get a palindrome (654606456).

The spelling of 531204321 in words is "five hundred thirty-one million, two hundred four thousand, three hundred twenty-one".