91432133 has 4 divisors (see below), whose sum is σ = 98465388. Its totient is φ = 84398880.

The previous prime is 91432129. The next prime is 91432139. The reversal of 91432133 is 33123419.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 13410244 + 78021889 = 3662^2 + 8833^2 .

It is a cyclic number.

It is not a de Polignac number, because 91432133 - 2² = 91432129 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91432139) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3516608 + ... + 3516633.

It is an arithmetic number, because the mean of its divisors is an integer number (24616347).

Almost surely, 2^91432133 is an apocalyptic number.

It is an amenable number.

91432133 is a deficient number, since it is larger than the sum of its proper divisors (7033255).

91432133 is a wasteful number, since it uses less digits than its factorization.

91432133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7033254.

The product of its digits is 1944, while the sum is 26.

The square root of 91432133 is about 9562.0151118893. The cubic root of 91432133 is about 450.5050017861.

The spelling of 91432133 in words is "ninety-one million, four hundred thirty-two thousand, one hundred thirty-three".