91166039 has 4 divisors (see below), whose sum is σ = 93630024. Its totient is φ = 88702056.

The previous prime is 91166017. The next prime is 91166051. The reversal of 91166039 is 93066119.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 93066119 = 23 ⋅4046353.

It is a cyclic number.

It is not a de Polignac number, because 91166039 - 2⁸ = 91165783 is a prime.

It is a super-3 number, since 3×91166039³ (a number of 25 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91162039) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1231937 + ... + 1232010.

It is an arithmetic number, because the mean of its divisors is an integer number (23407506).

Almost surely, 2^91166039 is an apocalyptic number.

91166039 is a deficient number, since it is larger than the sum of its proper divisors (2463985).

91166039 is a wasteful number, since it uses less digits than its factorization.

91166039 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2463984.

The product of its (nonzero) digits is 8748, while the sum is 35.

The square root of 91166039 is about 9548.0908562916. The cubic root of 91166039 is about 450.0675437708.

The spelling of 91166039 in words is "ninety-one million, one hundred sixty-six thousand, thirty-nine".