91015 has 8 divisors (see below), whose sum is σ = 110880. Its totient is φ = 71712.

The previous prime is 91009. The next prime is 91019. The reversal of 91015 is 51019.

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 91015 - 2⁷ = 90887 is a prime.

91015 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 91015.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91019) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 462 + ... + 628.

It is an arithmetic number, because the mean of its divisors is an integer number (13860).

2⁹¹⁰¹⁵ is an apocalyptic number.

91015 is a deficient number, since it is larger than the sum of its proper divisors (19865).

91015 is a wasteful number, since it uses less digits than its factorization.

91015 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 281.

The product of its (nonzero) digits is 45, while the sum is 16.

The square root of 91015 is about 301.6869238134. The cubic root of 91015 is about 44.9818857134.

It can be divided in two parts, 9 and 1015, that added together give a 10-th power (1024 = 2¹⁰).

The spelling of 91015 in words is "ninety-one thousand, fifteen".