133682809 has 8 divisors (see below), whose sum is σ = 144800712. Its totient is φ = 122684160.

The previous prime is 133682777. The next prime is 133682897. The reversal of 133682809 is 908286331.

It can be written as a sum of positive squares in 4 ways, for example, as 4928400 + 128754409 = 2220^2 + 11347^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 133682809 - 2⁵ = 133682777 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (133682009) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27472 + ... + 31969.

It is an arithmetic number, because the mean of its divisors is an integer number (18100089).

Almost surely, 2^133682809 is an apocalyptic number.

It is an amenable number.

133682809 is a deficient number, since it is larger than the sum of its proper divisors (11117903).

133682809 is a wasteful number, since it uses less digits than its factorization.

133682809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59627.

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

The square root of 133682809 is about 11562.1282210500. The cubic root of 133682809 is about 511.3189096961.

The spelling of 133682809 in words is "one hundred thirty-three million, six hundred eighty-two thousand, eight hundred nine".