133289291 has 4 divisors (see below), whose sum is σ = 134184000. Its totient is φ = 132394584.

The previous prime is 133289279. The next prime is 133289297. The reversal of 133289291 is 192982331.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 192982331 = 71 ⋅2718061.

It is a cyclic number.

It is not a de Polignac number, because 133289291 - 2²⁶ = 66180427 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (133289297) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 447131 + ... + 447428.

It is an arithmetic number, because the mean of its divisors is an integer number (33546000).

Almost surely, 2^133289291 is an apocalyptic number.

133289291 is a deficient number, since it is larger than the sum of its proper divisors (894709).

133289291 is an equidigital number, since it uses as much as digits as its factorization.

133289291 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 894708.

The product of its digits is 23328, while the sum is 38.

The square root of 133289291 is about 11545.0981373049. The cubic root of 133289291 is about 510.8166986420.

The spelling of 133289291 in words is "one hundred thirty-three million, two hundred eighty-nine thousand, two hundred ninety-one".