616140209 has 2 divisors, whose sum is σ = 616140210. Its totient is φ = 616140208.

The previous prime is 616140193. The next prime is 616140223. The reversal of 616140209 is 902041616.

616140209 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 571210000 + 44930209 = 23900^2 + 6703^2 .

It is a cyclic number.

It is not a de Polignac number, because 616140209 - 2⁴ = 616140193 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (616140269) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 308070104 + 308070105.

It is an arithmetic number, because the mean of its divisors is an integer number (308070105).

Almost surely, 2^616140209 is an apocalyptic number.

It is an amenable number.

616140209 is a deficient number, since it is larger than the sum of its proper divisors (1).

616140209 is an equidigital number, since it uses as much as digits as its factorization.

616140209 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 29.

The square root of 616140209 is about 24822.1717220714. The cubic root of 616140209 is about 850.9287237615.

The spelling of 616140209 in words is "six hundred sixteen million, one hundred forty thousand, two hundred nine".