531221 has 8 divisors (see below), whose sum is σ = 568320. Its totient is φ = 495072.

The previous prime is 531203. The next prime is 531229. The reversal of 531221 is 122135.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 531221 - 2¹⁰ = 530197 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 531196 and 531205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (531229) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1196 + ... + 1578.

It is an arithmetic number, because the mean of its divisors is an integer number (71040).

2⁵³¹²²¹ is an apocalyptic number.

It is an amenable number.

531221 is a deficient number, since it is larger than the sum of its proper divisors (37099).

531221 is a wasteful number, since it uses less digits than its factorization.

531221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 475.

The product of its digits is 60, while the sum is 14.

The square root of 531221 is about 728.8490927483. The cubic root of 531221 is about 80.9888212994.

Adding to 531221 its reverse (122135), we get a palindrome (653356).

The spelling of 531221 in words is "five hundred thirty-one thousand, two hundred twenty-one".