16140209 has 2 divisors, whose sum is σ = 16140210. Its totient is φ = 16140208.

The previous prime is 16140193. The next prime is 16140221. The reversal of 16140209 is 90204161.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11751184 + 4389025 = 3428^2 + 2095^2 .

It is an emirp because it is prime and its reverse (90204161) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 16140209 - 2⁴ = 16140193 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 (16110209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8070104 + 8070105.

It is an arithmetic number, because the mean of its divisors is an integer number (8070105).

Almost surely, 2^16140209 is an apocalyptic number.

It is an amenable number.

16140209 is a deficient number, since it is larger than the sum of its proper divisors (1).

16140209 is an equidigital number, since it uses as much as digits as its factorization.

16140209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 432, while the sum is 23.

The square root of 16140209 is about 4017.4878966837. The cubic root of 16140209 is about 252.7181214917.

The spelling of 16140209 in words is "sixteen million, one hundred forty thousand, two hundred nine".