9611221 has 4 divisors (see below), whose sum is σ = 9768844. Its totient is φ = 9453600.

The previous prime is 9611201. The next prime is 9611237. The reversal of 9611221 is 1221169.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1221169 = 89 ⋅13721.

It can be written as a sum of positive squares in 2 ways, for example, as 1988100 + 7623121 = 1410^2 + 2761^2 .

It is a cyclic number.

It is not a de Polignac number, because 9611221 - 2¹⁵ = 9578453 is a prime.

It is a super-2 number, since 2×9611221² = 184751138221682, which contains 22 as substring.

It is a Duffinian number.

9611221 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 9611192 and 9611201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9611201) 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, 78720 + ... + 78841.

It is an arithmetic number, because the mean of its divisors is an integer number (2442211).

Almost surely, 2^9611221 is an apocalyptic number.

It is an amenable number.

9611221 is a deficient number, since it is larger than the sum of its proper divisors (157623).

9611221 is a wasteful number, since it uses less digits than its factorization.

9611221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157622.

The product of its digits is 216, while the sum is 22.

The square root of 9611221 is about 3100.1969292289. The cubic root of 9611221 is about 212.6144877878.

The spelling of 9611221 in words is "nine million, six hundred eleven thousand, two hundred twenty-one".