91684071 has 12 divisors (see below), whose sum is σ = 133121248. Its totient is φ = 60804864.

The previous prime is 91684069. The next prime is 91684091. The reversal of 91684071 is 17048619.

It is not a de Polignac number, because 91684071 - 2¹ = 91684069 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 (91684001) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 24655 + ... + 28128.

Almost surely, 2^91684071 is an apocalyptic number.

91684071 is a deficient number, since it is larger than the sum of its proper divisors (41437177).

91684071 is a wasteful number, since it uses less digits than its factorization.

91684071 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52982 (or 52979 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 36.

The square root of 91684071 is about 9575.1799460898. The cubic root of 91684071 is about 450.9184058302.

The spelling of 91684071 in words is "ninety-one million, six hundred eighty-four thousand, seventy-one".