9531221 has 4 divisors (see below), whose sum is σ = 10892832. Its totient is φ = 8169612.

The previous prime is 9531187. The next prime is 9531233. The reversal of 9531221 is 1221359.

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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9531221 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9531281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 680795 + ... + 680808.

It is an arithmetic number, because the mean of its divisors is an integer number (2723208).

Almost surely, 2^9531221 is an apocalyptic number.

It is an amenable number.

9531221 is a deficient number, since it is larger than the sum of its proper divisors (1361611).

9531221 is a wasteful number, since it uses less digits than its factorization.

9531221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1361610.

The product of its digits is 540, while the sum is 23.

The square root of 9531221 is about 3087.2675621008. The cubic root of 9531221 is about 212.0229371765.

The spelling of 9531221 in words is "nine million, five hundred thirty-one thousand, two hundred twenty-one".