140606209 has 2 divisors, whose sum is σ = 140606210. Its totient is φ = 140606208.

The previous prime is 140606177. The next prime is 140606231. The reversal of 140606209 is 902606041.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 104040000 + 36566209 = 10200^2 + 6047^2 .

It is a cyclic number.

It is not a de Polignac number, because 140606209 - 2⁵ = 140606177 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (140606009) 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, 70303104 + 70303105.

It is an arithmetic number, because the mean of its divisors is an integer number (70303105).

Almost surely, 2^140606209 is an apocalyptic number.

It is an amenable number.

140606209 is a deficient number, since it is larger than the sum of its proper divisors (1).

140606209 is an equidigital number, since it uses as much as digits as its factorization.

140606209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 140606209 is about 11857.7489010351. The cubic root of 140606209 is about 519.9977921504.

The spelling of 140606209 in words is "one hundred forty million, six hundred six thousand, two hundred nine".