8905681 has 2 divisors, whose sum is σ = 8905682. Its totient is φ = 8905680.

The previous prime is 8905679. The next prime is 8905691. The reversal of 8905681 is 1865098.

8905681 is nontrivially palindromic in base 14.

8905681 is digitally balanced in base 3, 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., 8880400 + 25281 = 2980^2 + 159^2 .

It is a cyclic number.

It is not a de Polignac number, because 8905681 - 2¹ = 8905679 is a prime.

It is a super-2 number, since 2×8905681² = 158622308147522, which contains 22 as substring.

Together with 8905679, it forms a pair of twin primes.

8905681 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 8905681.

It is not a weakly prime, because it can be changed into another prime (8905691) 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, 4452840 + 4452841.

It is an arithmetic number, because the mean of its divisors is an integer number (4452841).

Almost surely, 2^8905681 is an apocalyptic number.

It is an amenable number.

8905681 is a deficient number, since it is larger than the sum of its proper divisors (1).

8905681 is an equidigital number, since it uses as much as digits as its factorization.

8905681 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 17280, while the sum is 37.

The square root of 8905681 is about 2984.2387639061. The cubic root of 8905681 is about 207.2791941599.

The spelling of 8905681 in words is "eight million, nine hundred five thousand, six hundred eighty-one".