91255 has 4 divisors (see below), whose sum is σ = 109512. Its totient is φ = 73000.

The previous prime is 91253. The next prime is 91283. The reversal of 91255 is 55219.

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

It is not a de Polignac number, because 91255 - 2¹ = 91253 is a prime.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91253) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9121 + ... + 9130.

It is an arithmetic number, because the mean of its divisors is an integer number (27378).

2⁹¹²⁵⁵ is an apocalyptic number.

91255 is a deficient number, since it is larger than the sum of its proper divisors (18257).

91255 is a wasteful number, since it uses less digits than its factorization.

91255 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18256.

The product of its digits is 450, while the sum is 22.

The square root of 91255 is about 302.0844252854. The cubic root of 91255 is about 45.0213890089.

The spelling of 91255 in words is "ninety-one thousand, two hundred fifty-five".