91106505 has 64 divisors (see below), whose sum is σ = 186355200. Its totient is φ = 41368320.

The previous prime is 91106503. The next prime is 91106557. The reversal of 91106505 is 50560119.

91106505 is a `hidden beast` number, since 9 + 1 + 1 + 0 + 650 + 5 = 666.

It is not a de Polignac number, because 91106505 - 2¹ = 91106503 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (91106503) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 216195 + ... + 216615.

It is an arithmetic number, because the mean of its divisors is an integer number (2911800).

Almost surely, 2^91106505 is an apocalyptic number.

It is an amenable number.

91106505 is an abundant number, since it is smaller than the sum of its proper divisors (95248695).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

91106505 is a wasteful number, since it uses less digits than its factorization.

91106505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 671 (or 665 counting only the distinct ones).

The product of its (nonzero) digits is 1350, while the sum is 27.

The square root of 91106505 is about 9544.9727605688. The cubic root of 91106505 is about 449.9695534956.

The spelling of 91106505 in words is "ninety-one million, one hundred six thousand, five hundred five".