8319221 has 2 divisors, whose sum is σ = 8319222. Its totient is φ = 8319220.

The previous prime is 8319217. The next prime is 8319247. The reversal of 8319221 is 1229138.

It is an a-pointer prime, because the next prime (8319247) can be obtained adding 8319221 to its sum of digits (26).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6027025 + 2292196 = 2455^2 + 1514^2 .

It is a cyclic number.

It is not a de Polignac number, because 8319221 - 2² = 8319217 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8319211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4159610 + 4159611.

It is an arithmetic number, because the mean of its divisors is an integer number (4159611).

Almost surely, 2^8319221 is an apocalyptic number.

It is an amenable number.

8319221 is a deficient number, since it is larger than the sum of its proper divisors (1).

8319221 is an equidigital number, since it uses as much as digits as its factorization.

8319221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 864, while the sum is 26.

The square root of 8319221 is about 2884.3059823812. The cubic root of 8319221 is about 202.6255564386.

The spelling of 8319221 in words is "eight million, three hundred nineteen thousand, two hundred twenty-one".