133085591 has 4 divisors (see below), whose sum is σ = 135267384. Its totient is φ = 130903800.

The previous prime is 133085587. The next prime is 133085599. The reversal of 133085591 is 195580331.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 195580331 = 211 ⋅926921.

It is a cyclic number.

It is not a de Polignac number, because 133085591 - 2² = 133085587 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133085599) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1090805 + ... + 1090926.

It is an arithmetic number, because the mean of its divisors is an integer number (33816846).

Almost surely, 2^133085591 is an apocalyptic number.

133085591 is a deficient number, since it is larger than the sum of its proper divisors (2181793).

133085591 is an equidigital number, since it uses as much as digits as its factorization.

133085591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2181792.

The product of its (nonzero) digits is 16200, while the sum is 35.

The square root of 133085591 is about 11536.2728383131. The cubic root of 133085591 is about 510.5563466101.

The spelling of 133085591 in words is "one hundred thirty-three million, eighty-five thousand, five hundred ninety-one".