133291 has 4 divisors (see below), whose sum is σ = 136584. Its totient is φ = 130000.

The previous prime is 133283. The next prime is 133303. The reversal of 133291 is 192331.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 192331 = 41 ⋅4691.

It is a cyclic number.

It is not a de Polignac number, because 133291 - 2³ = 133283 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (133201) 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 3 ways as a sum of consecutive naturals, for example, 1585 + ... + 1666.

It is an arithmetic number, because the mean of its divisors is an integer number (34146).

2¹³³²⁹¹ is an apocalyptic number.

133291 is a deficient number, since it is larger than the sum of its proper divisors (3293).

133291 is an equidigital number, since it uses as much as digits as its factorization.

133291 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3292.

The product of its digits is 162, while the sum is 19.

The square root of 133291 is about 365.0903997642. The cubic root of 133291 is about 51.0818881818.

It can be divided in two parts, 133 and 291, that added together give a palindrome (424).

The spelling of 133291 in words is "one hundred thirty-three thousand, two hundred ninety-one".