133606809 has 24 divisors (see below), whose sum is σ = 221686400. Its totient is φ = 75955968.

The previous prime is 133606801. The next prime is 133606813. The reversal of 133606809 is 908606331.

It is a happy number.

It is not a de Polignac number, because 133606809 - 2³ = 133606801 is a prime.

It is a super-2 number, since 2×133606809² = 35701558822324962, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (133606801) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7209 + ... + 17865.

Almost surely, 2^133606809 is an apocalyptic number.

It is an amenable number.

133606809 is a deficient number, since it is larger than the sum of its proper divisors (88079591).

133606809 is a wasteful number, since it uses less digits than its factorization.

133606809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10869 (or 10866 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 36.

The square root of 133606809 is about 11558.8411616390. The cubic root of 133606809 is about 511.2219947078.

The spelling of 133606809 in words is "one hundred thirty-three million, six hundred six thousand, eight hundred nine".