908909081 has 2 divisors, whose sum is σ = 908909082. Its totient is φ = 908909080.

The previous prime is 908909051. The next prime is 908909129. The reversal of 908909081 is 180909809.

908909081 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 588499081 + 320410000 = 24259^2 + 17900^2 .

It is an emirp because it is prime and its reverse (180909809) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 908909081 - 2¹⁰ = 908908057 is a prime.

It is a super-2 number, since 2×908909081² = 1652231435048529122, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (908909021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 454454540 + 454454541.

It is an arithmetic number, because the mean of its divisors is an integer number (454454541).

Almost surely, 2^908909081 is an apocalyptic number.

It is an amenable number.

908909081 is a deficient number, since it is larger than the sum of its proper divisors (1).

908909081 is an equidigital number, since it uses as much as digits as its factorization.

908909081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 46656, while the sum is 44.

The square root of 908909081 is about 30148.1190292197. The cubic root of 908909081 is about 968.6647163716.

The spelling of 908909081 in words is "nine hundred eight million, nine hundred nine thousand, eighty-one".