91039 has 8 divisors (see below), whose sum is σ = 100800. Its totient is φ = 81696.

The previous prime is 91033. The next prime is 91079. The reversal of 91039 is 93019.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 91039 - 2⁷ = 90911 is a prime.

It is a Duffinian number.

91039 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91033) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 537 + ... + 685.

It is an arithmetic number, because the mean of its divisors is an integer number (12600).

2⁹¹⁰³⁹ is an apocalyptic number.

91039 is a deficient number, since it is larger than the sum of its proper divisors (9761).

91039 is a wasteful number, since it uses less digits than its factorization.

91039 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 209.

The product of its (nonzero) digits is 243, while the sum is 22.

The square root of 91039 is about 301.7266975261. The cubic root of 91039 is about 44.9858391657.

It can be divided in two parts, 910 and 39, that added together give a palindrome (949).

The spelling of 91039 in words is "ninety-one thousand, thirty-nine".