91866071 has 16 divisors (see below), whose sum is σ = 104986368. Its totient is φ = 79569600.

The previous prime is 91866043. The next prime is 91866077. The reversal of 91866071 is 17066819.

It is not a de Polignac number, because 91866071 - 2¹⁰ = 91865047 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 (91866077) 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 15 ways as a sum of consecutive naturals, for example, 83195 + ... + 84291.

It is an arithmetic number, because the mean of its divisors is an integer number (6561648).

Almost surely, 2^91866071 is an apocalyptic number.

91866071 is a deficient number, since it is larger than the sum of its proper divisors (13120297).

91866071 is a wasteful number, since it uses less digits than its factorization.

91866071 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1462.

The product of its (nonzero) digits is 18144, while the sum is 38.

The square root of 91866071 is about 9584.6789721931. The cubic root of 91866071 is about 451.2165779683.

The spelling of 91866071 in words is "ninety-one million, eight hundred sixty-six thousand, seventy-one".