908521 has 2 divisors, whose sum is σ = 908522. Its totient is φ = 908520.

The previous prime is 908513. The next prime is 908527. The reversal of 908521 is 125809.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 739600 + 168921 = 860^2 + 411^2 .

It is a cyclic number.

It is not a de Polignac number, because 908521 - 2³ = 908513 is a prime.

It is not a weakly prime, because it can be changed into another prime (908527) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 454260 + 454261.

It is an arithmetic number, because the mean of its divisors is an integer number (454261).

2⁹⁰⁸⁵²¹ is an apocalyptic number.

It is an amenable number.

908521 is a deficient number, since it is larger than the sum of its proper divisors (1).

908521 is an equidigital number, since it uses as much as digits as its factorization.

908521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 720, while the sum is 25.

The square root of 908521 is about 953.1636795430. The cubic root of 908521 is about 96.8526831701.

The spelling of 908521 in words is "nine hundred eight thousand, five hundred twenty-one".