9513221 has 4 divisors (see below), whose sum is σ = 9521100. Its totient is φ = 9505344.

The previous prime is 9513209. The next prime is 9513227. The reversal of 9513221 is 1223159.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1223159 = 7 ⋅174737.

It can be written as a sum of positive squares in 2 ways, for example, as 662596 + 8850625 = 814^2 + 2975^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9513221 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9513227) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1706 + ... + 4683.

It is an arithmetic number, because the mean of its divisors is an integer number (2380275).

Almost surely, 2^9513221 is an apocalyptic number.

It is an amenable number.

9513221 is a deficient number, since it is larger than the sum of its proper divisors (7879).

9513221 is a wasteful number, since it uses less digits than its factorization.

9513221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7878.

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

The square root of 9513221 is about 3084.3509852155. The cubic root of 9513221 is about 211.8893824842.

The spelling of 9513221 in words is "nine million, five hundred thirteen thousand, two hundred twenty-one".