91215 has 12 divisors (see below), whose sum is σ = 158184. Its totient is φ = 48624.

The previous prime is 91199. The next prime is 91229. The reversal of 91215 is 51219.

It is not a de Polignac number, because 91215 - 2⁴ = 91199 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 969 + ... + 1058.

It is an arithmetic number, because the mean of its divisors is an integer number (13182).

2⁹¹²¹⁵ is an apocalyptic number.

91215 is a deficient number, since it is larger than the sum of its proper divisors (66969).

91215 is a wasteful number, since it uses less digits than its factorization.

91215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2038 (or 2035 counting only the distinct ones).

The product of its digits is 90, while the sum is 18.

The square root of 91215 is about 302.0182113714. The cubic root of 91215 is about 45.0148099402.

Subtracting from 91215 its product of digits (90), we obtain a cube (91125 = 45³).

The spelling of 91215 in words is "ninety-one thousand, two hundred fifteen".