206472209 has 2 divisors, whose sum is σ = 206472210. Its totient is φ = 206472208.

The previous prime is 206472067. The next prime is 206472241. The reversal of 206472209 is 902274602.

It is an a-pointer prime, because the next prime (206472241) can be obtained adding 206472209 to its sum of digits (32).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 152596609 + 53875600 = 12353^2 + 7340^2 .

It is a cyclic number.

It is not a de Polignac number, because 206472209 - 2¹² = 206468113 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (206477209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 103236104 + 103236105.

It is an arithmetic number, because the mean of its divisors is an integer number (103236105).

Almost surely, 2^206472209 is an apocalyptic number.

It is an amenable number.

206472209 is a deficient number, since it is larger than the sum of its proper divisors (1).

206472209 is an equidigital number, since it uses as much as digits as its factorization.

206472209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12096, while the sum is 32.

The square root of 206472209 is about 14369.1408581028. The cubic root of 206472209 is about 591.0449823231.

The spelling of 206472209 in words is "two hundred six million, four hundred seventy-two thousand, two hundred nine".