133566091 has 2 divisors, whose sum is σ = 133566092. Its totient is φ = 133566090.

The previous prime is 133566089. The next prime is 133566131. The reversal of 133566091 is 190665331.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 133566091 - 2¹ = 133566089 is a prime.

Together with 133566089, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (133566061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 66783045 + 66783046.

It is an arithmetic number, because the mean of its divisors is an integer number (66783046).

Almost surely, 2^133566091 is an apocalyptic number.

133566091 is a deficient number, since it is larger than the sum of its proper divisors (1).

133566091 is an equidigital number, since it uses as much as digits as its factorization.

133566091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 14580, while the sum is 34.

The square root of 133566091 is about 11557.0796916868. The cubic root of 133566091 is about 511.1700561070.

The spelling of 133566091 in words is "one hundred thirty-three million, five hundred sixty-six thousand, ninety-one".