8939521 has 2 divisors, whose sum is σ = 8939522. Its totient is φ = 8939520.

The previous prime is 8939471. The next prime is 8939527. The reversal of 8939521 is 1259398.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6656400 + 2283121 = 2580^2 + 1511^2 .

It is a cyclic number.

It is not a de Polignac number, because 8939521 - 2⁷ = 8939393 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (8939527) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4469760 + 4469761.

It is an arithmetic number, because the mean of its divisors is an integer number (4469761).

Almost surely, 2^8939521 is an apocalyptic number.

It is an amenable number.

8939521 is a deficient number, since it is larger than the sum of its proper divisors (1).

8939521 is an equidigital number, since it uses as much as digits as its factorization.

8939521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 19440, while the sum is 37.

The square root of 8939521 is about 2989.9031756898. The cubic root of 8939521 is about 207.5414036507.

The spelling of 8939521 in words is "eight million, nine hundred thirty-nine thousand, five hundred twenty-one".