531725221 has 4 divisors (see below), whose sum is σ = 538456000. Its totient is φ = 524994444.

The previous prime is 531725189. The next prime is 531725239. The reversal of 531725221 is 122527135.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 122527135 = 5 ⋅24505427.

It is a cyclic number.

It is not a de Polignac number, because 531725221 - 2⁵ = 531725189 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 531725221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (531725281) 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, 3365271 + ... + 3365428.

It is an arithmetic number, because the mean of its divisors is an integer number (134614000).

Almost surely, 2^531725221 is an apocalyptic number.

It is an amenable number.

531725221 is a deficient number, since it is larger than the sum of its proper divisors (6730779).

531725221 is an equidigital number, since it uses as much as digits as its factorization.

531725221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6730778.

The product of its digits is 4200, while the sum is 28.

The square root of 531725221 is about 23059.1678297375. The cubic root of 531725221 is about 810.1443734933.

The spelling of 531725221 in words is "five hundred thirty-one million, seven hundred twenty-five thousand, two hundred twenty-one".