8339521 has 2 divisors, whose sum is σ = 8339522. Its totient is φ = 8339520.

The previous prime is 8339519. The next prime is 8339533. The reversal of 8339521 is 1259338.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7049025 + 1290496 = 2655^2 + 1136^2 .

It is a cyclic number.

It is not a de Polignac number, because 8339521 - 2¹ = 8339519 is a prime.

It is a super-2 number, since 2×8339521² = 139095221018882, which contains 22 as substring.

Together with 8339519, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (8339561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4169760 + 4169761.

It is an arithmetic number, because the mean of its divisors is an integer number (4169761).

Almost surely, 2^8339521 is an apocalyptic number.

It is an amenable number.

8339521 is a deficient number, since it is larger than the sum of its proper divisors (1).

8339521 is an equidigital number, since it uses as much as digits as its factorization.

8339521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6480, while the sum is 31.

The square root of 8339521 is about 2887.8228823804. The cubic root of 8339521 is about 202.7902336225.

The spelling of 8339521 in words is "eight million, three hundred thirty-nine thousand, five hundred twenty-one".