91684085 has 4 divisors (see below), whose sum is σ = 110020908. Its totient is φ = 73347264.

The previous prime is 91684069. The next prime is 91684091. The reversal of 91684085 is 58048619.

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 10125124 + 81558961 = 3182^2 + 9031^2 .

It is a cyclic number.

It is not a de Polignac number, because 91684085 - 2⁴ = 91684069 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9168404 + ... + 9168413.

It is an arithmetic number, because the mean of its divisors is an integer number (27505227).

Almost surely, 2^91684085 is an apocalyptic number.

It is an amenable number.

91684085 is a deficient number, since it is larger than the sum of its proper divisors (18336823).

91684085 is a wasteful number, since it uses less digits than its factorization.

91684085 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18336822.

The product of its (nonzero) digits is 69120, while the sum is 41.

The square root of 91684085 is about 9575.1806771465. The cubic root of 91684085 is about 450.9184287817.

The spelling of 91684085 in words is "ninety-one million, six hundred eighty-four thousand, eighty-five".