133909091 has 8 divisors (see below), whose sum is σ = 136602864. Its totient is φ = 131231520.

The previous prime is 133909073. The next prime is 133909103. The reversal of 133909091 is 190909331.

It is a happy number.

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 133909091 - 2²² = 129714787 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (133909001) 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 7 ways as a sum of consecutive naturals, for example, 13385 + ... + 21141.

It is an arithmetic number, because the mean of its divisors is an integer number (17075358).

Almost surely, 2^133909091 is an apocalyptic number.

133909091 is a deficient number, since it is larger than the sum of its proper divisors (2693773).

133909091 is an equidigital number, since it uses as much as digits as its factorization.

133909091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8101.

The product of its (nonzero) digits is 6561, while the sum is 35.

The square root of 133909091 is about 11571.9095658409. The cubic root of 133909091 is about 511.6072465572.

The spelling of 133909091 in words is "one hundred thirty-three million, nine hundred nine thousand, ninety-one".