133286809 has 4 divisors (see below), whose sum is σ = 135164160. Its totient is φ = 131409460.

The previous prime is 133286789. The next prime is 133286819. The reversal of 133286809 is 908682331.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 908682331 = 3581 ⋅253751.

It is a cyclic number.

It is not a de Polignac number, because 133286809 - 2²¹ = 131189657 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (133286819) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 938569 + ... + 938710.

It is an arithmetic number, because the mean of its divisors is an integer number (33791040).

Almost surely, 2^133286809 is an apocalyptic number.

It is an amenable number.

133286809 is a deficient number, since it is larger than the sum of its proper divisors (1877351).

133286809 is an equidigital number, since it uses as much as digits as its factorization.

133286809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1877350.

The product of its (nonzero) digits is 62208, while the sum is 40.

The square root of 133286809 is about 11544.9906452972. The cubic root of 133286809 is about 510.8135279574.

The spelling of 133286809 in words is "one hundred thirty-three million, two hundred eighty-six thousand, eight hundred nine".