91115 has 4 divisors (see below), whose sum is σ = 109344. Its totient is φ = 72888.

The previous prime is 91099. The next prime is 91121. The reversal of 91115 is 51119.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 91115 - 2⁴ = 91099 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a plaindrome in base 12.

It is a junction number, because it is equal to n+sod(n) for n = 91093 and 91102.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9107 + ... + 9116.

It is an arithmetic number, because the mean of its divisors is an integer number (27336).

2⁹¹¹¹⁵ is an apocalyptic number.

91115 is a deficient number, since it is larger than the sum of its proper divisors (18229).

91115 is a wasteful number, since it uses less digits than its factorization.

91115 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18228.

The product of its digits is 45, while the sum is 17.

The square root of 91115 is about 301.8526130415. The cubic root of 91115 is about 44.9983538492.

The spelling of 91115 in words is "ninety-one thousand, one hundred fifteen".