133634809 has 24 divisors (see below), whose sum is σ = 178524000. Its totient is φ = 98642880.

The previous prime is 133634801. The next prime is 133634819. The reversal of 133634809 is 908436331.

It is not a de Polignac number, because 133634809 - 2³ = 133634801 is a prime.

It is not an unprimeable number, because it can be changed into a prime (133634801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3717 + ... + 16765.

It is an arithmetic number, because the mean of its divisors is an integer number (7438500).

Almost surely, 2^133634809 is an apocalyptic number.

133634809 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

133634809 is a deficient number, since it is larger than the sum of its proper divisors (44889191).

133634809 is a wasteful number, since it uses less digits than its factorization.

133634809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13093 (or 13086 counting only the distinct ones).

The product of its (nonzero) digits is 46656, while the sum is 37.

The square root of 133634809 is about 11560.0522922693. The cubic root of 133634809 is about 511.2577045047.

The spelling of 133634809 in words is "one hundred thirty-three million, six hundred thirty-four thousand, eight hundred nine".