531406321 has 4 divisors (see below), whose sum is σ = 545768692. Its totient is φ = 517043952.

The previous prime is 531406277. The next prime is 531406357. The reversal of 531406321 is 123604135.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 333610225 + 197796096 = 18265^2 + 14064^2 .

It is a cyclic number.

It is not a de Polignac number, because 531406321 - 2¹⁷ = 531275249 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (531406021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7181130 + ... + 7181203.

It is an arithmetic number, because the mean of its divisors is an integer number (136442173).

Almost surely, 2^531406321 is an apocalyptic number.

It is an amenable number.

531406321 is a deficient number, since it is larger than the sum of its proper divisors (14362371).

531406321 is a wasteful number, since it uses less digits than its factorization.

531406321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14362370.

The product of its (nonzero) digits is 2160, while the sum is 25.

The square root of 531406321 is about 23052.2519724213. The cubic root of 531406321 is about 809.9823808594.

The spelling of 531406321 in words is "five hundred thirty-one million, four hundred six thousand, three hundred twenty-one".