133436209 has 2 divisors, whose sum is σ = 133436210. Its totient is φ = 133436208.

The previous prime is 133436167. The next prime is 133436227. The reversal of 133436209 is 902634331.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 111767184 + 21669025 = 10572^2 + 4655^2 .

It is an emirp because it is prime and its reverse (902634331) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 133436209 - 2⁷ = 133436081 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (133436249) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 66718104 + 66718105.

It is an arithmetic number, because the mean of its divisors is an integer number (66718105).

Almost surely, 2^133436209 is an apocalyptic number.

It is an amenable number.

133436209 is a deficient number, since it is larger than the sum of its proper divisors (1).

133436209 is an equidigital number, since it uses as much as digits as its factorization.

133436209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11664, while the sum is 31.

The square root of 133436209 is about 11551.4591718969. The cubic root of 133436209 is about 511.0043121407.

The spelling of 133436209 in words is "one hundred thirty-three million, four hundred thirty-six thousand, two hundred nine".