8640481 has 2 divisors, whose sum is σ = 8640482. Its totient is φ = 8640480.

The previous prime is 8640451. The next prime is 8640493. The reversal of 8640481 is 1840468.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6051600 + 2588881 = 2460^2 + 1609^2 .

It is a cyclic number.

It is not a de Polignac number, because 8640481 - 2¹⁵ = 8607713 is a prime.

It is a super-2 number, since 2×8640481² = 149315823822722, which contains 22 as substring.

8640481 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (8640451) 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, 4320240 + 4320241.

It is an arithmetic number, because the mean of its divisors is an integer number (4320241).

Almost surely, 2^8640481 is an apocalyptic number.

It is an amenable number.

8640481 is a deficient number, since it is larger than the sum of its proper divisors (1).

8640481 is an equidigital number, since it uses as much as digits as its factorization.

8640481 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6144, while the sum is 31.

The square root of 8640481 is about 2939.4695099626. The cubic root of 8640481 is about 205.2009213936.

The spelling of 8640481 in words is "eight million, six hundred forty thousand, four hundred eighty-one".