8529221 has 2 divisors, whose sum is σ = 8529222. Its totient is φ = 8529220.

The previous prime is 8529197. The next prime is 8529229. The reversal of 8529221 is 1229258.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4468996 + 4060225 = 2114^2 + 2015^2 .

It is a cyclic number.

It is not a de Polignac number, because 8529221 - 2¹⁴ = 8512837 is a prime.

It is a super-2 number, since 2×8529221² = 145495221733682, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8529229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4264610 + 4264611.

It is an arithmetic number, because the mean of its divisors is an integer number (4264611).

Almost surely, 2^8529221 is an apocalyptic number.

It is an amenable number.

8529221 is a deficient number, since it is larger than the sum of its proper divisors (1).

8529221 is an equidigital number, since it uses as much as digits as its factorization.

8529221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2880, while the sum is 29.

The square root of 8529221 is about 2920.4830079971. The cubic root of 8529221 is about 204.3163504489.

The spelling of 8529221 in words is "eight million, five hundred twenty-nine thousand, two hundred twenty-one".