91066 has 4 divisors (see below), whose sum is σ = 136602. Its totient is φ = 45532.

The previous prime is 91033. The next prime is 91079. The reversal of 91066 is 66019.

91066 is nontrivially palindromic in base 15.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 66019 = 107 ⋅617.

It can be written as a sum of positive squares in only one way, i.e., 77841 + 13225 = 279^2 + 115^2 .

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22765 + ... + 22768.

2⁹¹⁰⁶⁶ is an apocalyptic number.

91066 is a deficient number, since it is larger than the sum of its proper divisors (45536).

91066 is a wasteful number, since it uses less digits than its factorization.

91066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45535.

The product of its (nonzero) digits is 324, while the sum is 22.

The square root of 91066 is about 301.7714366868. The cubic root of 91066 is about 44.9902859691.

The spelling of 91066 in words is "ninety-one thousand, sixty-six".