91488709 has 4 divisors (see below), whose sum is σ = 98526316. Its totient is φ = 84451104.

The previous prime is 91488673. The next prime is 91488721. The reversal of 91488709 is 90788419.

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 61183684 + 30305025 = 7822^2 + 5505^2 .

It is a cyclic number.

It is not a de Polignac number, because 91488709 - 2⁷ = 91488581 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91488739) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3518784 + ... + 3518809.

It is an arithmetic number, because the mean of its divisors is an integer number (24631579).

Almost surely, 2^91488709 is an apocalyptic number.

It is an amenable number.

91488709 is a deficient number, since it is larger than the sum of its proper divisors (7037607).

91488709 is a wasteful number, since it uses less digits than its factorization.

91488709 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7037606.

The product of its (nonzero) digits is 145152, while the sum is 46.

The square root of 91488709 is about 9564.9730266217. The cubic root of 91488709 is about 450.5979031723.

The spelling of 91488709 in words is "ninety-one million, four hundred eighty-eight thousand, seven hundred nine".