133081 has 8 divisors (see below), whose sum is σ = 148680. Its totient is φ = 118272.

The previous prime is 133073. The next prime is 133087. The reversal of 133081 is 180331.

133081 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 3481 + 129600 = 59^2 + 360^2 .

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 133081 - 2³ = 133073 is a prime.

It is a super-2 number, since 2×133081² = 35421105122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133087) 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, 201 + ... + 553.

It is an arithmetic number, because the mean of its divisors is an integer number (18585).

2¹³³⁰⁸¹ is an apocalyptic number.

It is an amenable number.

133081 is a deficient number, since it is larger than the sum of its proper divisors (15599).

133081 is a wasteful number, since it uses less digits than its factorization.

133081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 395.

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 133081 is about 364.8026863936. The cubic root of 133081 is about 51.0550475724.

The spelling of 133081 in words is "one hundred thirty-three thousand, eighty-one".