9387221 has 2 divisors, whose sum is σ = 9387222. Its totient is φ = 9387220.

The previous prime is 9387199. The next prime is 9387223. The reversal of 9387221 is 1227839.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7980625 + 1406596 = 2825^2 + 1186^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9387221 is a prime.

Together with 9387223, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9387223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4693610 + 4693611.

It is an arithmetic number, because the mean of its divisors is an integer number (4693611).

Almost surely, 2^9387221 is an apocalyptic number.

It is an amenable number.

9387221 is a deficient number, since it is larger than the sum of its proper divisors (1).

9387221 is an equidigital number, since it uses as much as digits as its factorization.

9387221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6048, while the sum is 32.

The square root of 9387221 is about 3063.8572094665. The cubic root of 9387221 is about 210.9497495694.

The spelling of 9387221 in words is "nine million, three hundred eighty-seven thousand, two hundred twenty-one".