9561221 has 2 divisors, whose sum is σ = 9561222. Its totient is φ = 9561220.

The previous prime is 9561203. The next prime is 9561229. The reversal of 9561221 is 1221659.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7344100 + 2217121 = 2710^2 + 1489^2 .

It is an emirp because it is prime and its reverse (1221659) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9561221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9561229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4780610 + 4780611.

It is an arithmetic number, because the mean of its divisors is an integer number (4780611).

Almost surely, 2^9561221 is an apocalyptic number.

It is an amenable number.

9561221 is a deficient number, since it is larger than the sum of its proper divisors (1).

9561221 is an equidigital number, since it uses as much as digits as its factorization.

9561221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1080, while the sum is 26.

The square root of 9561221 is about 3092.1224102548. The cubic root of 9561221 is about 212.2451551634.

It can be divided in two parts, 95 and 61221, that added together give a palindrome (61316).

The spelling of 9561221 in words is "nine million, five hundred sixty-one thousand, two hundred twenty-one".