133440091 has 4 divisors (see below), whose sum is σ = 133513432. Its totient is φ = 133366752.

The previous prime is 133440077. The next prime is 133440101. The reversal of 133440091 is 190044331.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-133440091 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (133440011) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33870 + ... + 37603.

It is an arithmetic number, because the mean of its divisors is an integer number (33378358).

Almost surely, 2^133440091 is an apocalyptic number.

133440091 is a deficient number, since it is larger than the sum of its proper divisors (73341).

133440091 is an equidigital number, since it uses as much as digits as its factorization.

133440091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73340.

The product of its (nonzero) digits is 1296, while the sum is 25.

The square root of 133440091 is about 11551.6272013946. The cubic root of 133440091 is about 511.0092675660.

The spelling of 133440091 in words is "one hundred thirty-three million, four hundred forty thousand, ninety-one".