9143221 has 2 divisors, whose sum is σ = 9143222. Its totient is φ = 9143220.

The previous prime is 9143203. The next prime is 9143273. The reversal of 9143221 is 1223419.

9143221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5340721 + 3802500 = 2311^2 + 1950^2 .

It is an emirp because it is prime and its reverse (1223419) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 9143221 - 2¹⁷ = 9012149 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 9143192 and 9143201.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9143291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4571610 + 4571611.

It is an arithmetic number, because the mean of its divisors is an integer number (4571611).

Almost surely, 2^9143221 is an apocalyptic number.

It is an amenable number.

9143221 is a deficient number, since it is larger than the sum of its proper divisors (1).

9143221 is an equidigital number, since it uses as much as digits as its factorization.

9143221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 432, while the sum is 22.

The square root of 9143221 is about 3023.7759506948. The cubic root of 9143221 is about 209.1059572775.

The spelling of 9143221 in words is "nine million, one hundred forty-three thousand, two hundred twenty-one".