91940549089 has 3 divisors (see below), whose sum is σ = 91940852307. Its totient is φ = 91940245872.

The previous prime is 91940549033. The next prime is 91940549093. The reversal of 91940549089 is 98094504919.

It is a happy number.

The square root of 91940549089 is 303217.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 55462605025 + 36477944064 = 235505^2 + 190992^2 .

It is not a de Polignac number, because 91940549089 - 2⁹ = 91940548577 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91940549009) 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 2 ways as a sum of consecutive naturals, for example, 151609 + ... + 454825.

It is an arithmetic number, because the mean of its divisors is an integer number (30646950769).

Almost surely, 2^91940549089 is an apocalyptic number.

91940549089 is the 303217-th square number.

91940549089 is the 151609-th centered octagonal number.

It is an amenable number.

91940549089 is a deficient number, since it is larger than the sum of its proper divisors (303218).

91940549089 is an frugal number, since it uses more digits than its factorization.

91940549089 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 606434 (or 303217 counting only the distinct ones).

The product of its (nonzero) digits is 4199040, while the sum is 58.

The spelling of 91940549089 in words is "ninety-one billion, nine hundred forty million, five hundred forty-nine thousand, eighty-nine".