40568609 has 2 divisors, whose sum is σ = 40568610. Its totient is φ = 40568608.

The previous prime is 40568597. The next prime is 40568617. The reversal of 40568609 is 90686504.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22591009 + 17977600 = 4753^2 + 4240^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40568609 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (40568659) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20284304 + 20284305.

It is an arithmetic number, because the mean of its divisors is an integer number (20284305).

Almost surely, 2^40568609 is an apocalyptic number.

It is an amenable number.

40568609 is a deficient number, since it is larger than the sum of its proper divisors (1).

40568609 is an equidigital number, since it uses as much as digits as its factorization.

40568609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 51840, while the sum is 38.

The square root of 40568609 is about 6369.3491818238. The cubic root of 40568609 is about 343.6080836110.

The spelling of 40568609 in words is "forty million, five hundred sixty-eight thousand, six hundred nine".