531303213 has 16 divisors (see below), whose sum is σ = 852216320. Its totient is φ = 287622576.

The previous prime is 531303191. The next prime is 531303221. The reversal of 531303213 is 312303135.

It is not a de Polignac number, because 531303213 - 2¹⁶ = 531237677 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 531303213.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (531303713) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 665395 + ... + 666192.

It is an arithmetic number, because the mean of its divisors is an integer number (53263520).

Almost surely, 2^531303213 is an apocalyptic number.

It is an amenable number.

531303213 is a deficient number, since it is larger than the sum of its proper divisors (320913107).

531303213 is a wasteful number, since it uses less digits than its factorization.

531303213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1331616.

The product of its (nonzero) digits is 810, while the sum is 21.

The square root of 531303213 is about 23050.0154663723. The cubic root of 531303213 is about 809.9299909009.

Adding to 531303213 its reverse (312303135), we get a palindrome (843606348).

The spelling of 531303213 in words is "five hundred thirty-one million, three hundred three thousand, two hundred thirteen".