91505 has 4 divisors (see below), whose sum is σ = 109812. Its totient is φ = 73200.

The previous prime is 91499. The next prime is 91513. The reversal of 91505 is 50519.

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

It can be written as a sum of positive squares in 2 ways, for example, as 12544 + 78961 = 112^2 + 281^2 .

It is not a de Polignac number, because 91505 - 2⁸ = 91249 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9146 + ... + 9155.

It is an arithmetic number, because the mean of its divisors is an integer number (27453).

2⁹¹⁵⁰⁵ is an apocalyptic number.

It is an amenable number.

91505 is a deficient number, since it is larger than the sum of its proper divisors (18307).

91505 is a wasteful number, since it uses less digits than its factorization.

91505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18306.

The product of its (nonzero) digits is 225, while the sum is 20.

The square root of 91505 is about 302.4979338772. The cubic root of 91505 is about 45.0624646927.

The spelling of 91505 in words is "ninety-one thousand, five hundred five".