91085539 has 4 divisors (see below), whose sum is σ = 91421920. Its totient is φ = 90749160.

The previous prime is 91085521. The next prime is 91085551. The reversal of 91085539 is 93558019.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91085539 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91085509) 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 3 ways as a sum of consecutive naturals, for example, 167784 + ... + 168325.

It is an arithmetic number, because the mean of its divisors is an integer number (22855480).

Almost surely, 2^91085539 is an apocalyptic number.

91085539 is a deficient number, since it is larger than the sum of its proper divisors (336381).

91085539 is a wasteful number, since it uses less digits than its factorization.

91085539 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 336380.

The product of its (nonzero) digits is 48600, while the sum is 40.

The square root of 91085539 is about 9543.8744228956. The cubic root of 91085539 is about 449.9350342429.

The spelling of 91085539 in words is "ninety-one million, eighty-five thousand, five hundred thirty-nine".