91009448 has 8 divisors (see below), whose sum is σ = 170642730. Its totient is φ = 45504720.

The previous prime is 91009403. The next prime is 91009481. The reversal of 91009448 is 84490019.

It can be written as a sum of positive squares in only one way, i.e., 51294244 + 39715204 = 7162^2 + 6302^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 5688083 + ... + 5688098.

Almost surely, 2^91009448 is an apocalyptic number.

It is an amenable number.

91009448 is a deficient number, since it is larger than the sum of its proper divisors (79633282).

91009448 is a wasteful number, since it uses less digits than its factorization.

91009448 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11376187 (or 11376183 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 35.

The square root of 91009448 is about 9539.8872110733. The cubic root of 91009448 is about 449.8097104910.

The spelling of 91009448 in words is "ninety-one million, nine thousand, four hundred forty-eight".