9156221 has 2 divisors, whose sum is σ = 9156222. Its totient is φ = 9156220.

The previous prime is 9156209. The next prime is 9156239. The reversal of 9156221 is 1226519.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4687225 + 4468996 = 2165^2 + 2114^2 .

It is a cyclic number.

It is not a de Polignac number, because 9156221 - 2²² = 4961917 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9156241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4578110 + 4578111.

It is an arithmetic number, because the mean of its divisors is an integer number (4578111).

Almost surely, 2^9156221 is an apocalyptic number.

It is an amenable number.

9156221 is a deficient number, since it is larger than the sum of its proper divisors (1).

9156221 is an equidigital number, since it uses as much as digits as its factorization.

9156221 is an odious number, because the sum of its binary digits is odd.

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

The square root of 9156221 is about 3025.9248173079. The cubic root of 9156221 is about 209.2050139125.

The spelling of 9156221 in words is "nine million, one hundred fifty-six thousand, two hundred twenty-one".