133413209 has 2 divisors, whose sum is σ = 133413210. Its totient is φ = 133413208.

The previous prime is 133413199. The next prime is 133413211. The reversal of 133413209 is 902314331.

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., 131905225 + 1507984 = 11485^2 + 1228^2 .

It is a cyclic number.

It is not a de Polignac number, because 133413209 - 2⁸ = 133412953 is a prime.

Together with 133413211, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (133493209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 66706604 + 66706605.

It is an arithmetic number, because the mean of its divisors is an integer number (66706605).

Almost surely, 2^133413209 is an apocalyptic number.

It is an amenable number.

133413209 is a deficient number, since it is larger than the sum of its proper divisors (1).

133413209 is an equidigital number, since it uses as much as digits as its factorization.

133413209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1944, while the sum is 26.

The square root of 133413209 is about 11550.4635837701. The cubic root of 133413209 is about 510.9749503590.

The spelling of 133413209 in words is "one hundred thirty-three million, four hundred thirteen thousand, two hundred nine".