133539 has 8 divisors (see below), whose sum is σ = 203520. Its totient is φ = 76296.

The previous prime is 133519. The next prime is 133541. The reversal of 133539 is 935331.

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

It is not a de Polignac number, because 133539 - 2⁸ = 133283 is a prime.

It is not an unprimeable number, because it can be changed into a prime (133519) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3159 + ... + 3200.

It is an arithmetic number, because the mean of its divisors is an integer number (25440).

2¹³³⁵³⁹ is an apocalyptic number.

133539 is a deficient number, since it is larger than the sum of its proper divisors (69981).

133539 is an equidigital number, since it uses as much as digits as its factorization.

133539 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6369.

The product of its digits is 1215, while the sum is 24.

The square root of 133539 is about 365.4298838355. The cubic root of 133539 is about 51.1135493831.

The spelling of 133539 in words is "one hundred thirty-three thousand, five hundred thirty-nine".