133169209 has 2 divisors, whose sum is σ = 133169210. Its totient is φ = 133169208.

The previous prime is 133169203. The next prime is 133169213. The reversal of 133169209 is 902961331.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 94381225 + 38787984 = 9715^2 + 6228^2 .

It is an emirp because it is prime and its reverse (902961331) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 133169209 - 2¹⁷ = 133038137 is a prime.

It is not a weakly prime, because it can be changed into another prime (133169203) 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, 66584604 + 66584605.

It is an arithmetic number, because the mean of its divisors is an integer number (66584605).

Almost surely, 2^133169209 is an apocalyptic number.

It is an amenable number.

133169209 is a deficient number, since it is larger than the sum of its proper divisors (1).

133169209 is an equidigital number, since it uses as much as digits as its factorization.

133169209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8748, while the sum is 34.

The square root of 133169209 is about 11539.8964033478. The cubic root of 133169209 is about 510.6632521543.

The spelling of 133169209 in words is "one hundred thirty-three million, one hundred sixty-nine thousand, two hundred nine".