140566609 has 2 divisors, whose sum is σ = 140566610. Its totient is φ = 140566608.

The previous prime is 140566607. The next prime is 140566627. The reversal of 140566609 is 906665041.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 138133009 + 2433600 = 11753^2 + 1560^2 .

It is a cyclic number.

It is not a de Polignac number, because 140566609 - 2¹ = 140566607 is a prime.

Together with 140566607, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (140566607) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 70283304 + 70283305.

It is an arithmetic number, because the mean of its divisors is an integer number (70283305).

Almost surely, 2^140566609 is an apocalyptic number.

It is an amenable number.

140566609 is a deficient number, since it is larger than the sum of its proper divisors (1).

140566609 is an equidigital number, since it uses as much as digits as its factorization.

140566609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 38880, while the sum is 37.

The square root of 140566609 is about 11856.0789892780. The cubic root of 140566609 is about 519.9489705842.

The spelling of 140566609 in words is "one hundred forty million, five hundred sixty-six thousand, six hundred nine".