91539 has 12 divisors (see below), whose sum is σ = 151216. Its totient is φ = 52272.

The previous prime is 91529. The next prime is 91541. The reversal of 91539 is 93519.

It is not a de Polignac number, because 91539 - 2⁷ = 91411 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91529) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 664 + ... + 789.

2⁹¹⁵³⁹ is an apocalyptic number.

91539 is a deficient number, since it is larger than the sum of its proper divisors (59677).

91539 is a wasteful number, since it uses less digits than its factorization.

91539 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1466 (or 1463 counting only the distinct ones).

The product of its digits is 1215, while the sum is 27.

The square root of 91539 is about 302.5541273888. The cubic root of 91539 is about 45.0680452041.

It can be divided in two parts, 91 and 539, that added together give a triangular number (630 = T₃₅).

The spelling of 91539 in words is "ninety-one thousand, five hundred thirty-nine".