91784161 has 16 divisors (see below), whose sum is σ = 108126720. Its totient is φ = 76265280.

The previous prime is 91784123. The next prime is 91784183. The reversal of 91784161 is 16148719.

It is not a de Polignac number, because 91784161 - 2¹¹ = 91782113 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a Duffinian number.

Its product of digits (12096) is a multiple of the sum of its prime divisors (1344).

It is a self number, because there is not a number n which added to its sum of digits gives 91784161.

It is not an unprimeable number, because it can be changed into a prime (91784111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 100296 + ... + 101206.

It is an arithmetic number, because the mean of its divisors is an integer number (6757920).

Almost surely, 2^91784161 is an apocalyptic number.

It is an amenable number.

91784161 is a deficient number, since it is larger than the sum of its proper divisors (16342559).

91784161 is a wasteful number, since it uses less digits than its factorization.

91784161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1344.

The product of its digits is 12096, while the sum is 37.

The square root of 91784161 is about 9580.4050540674. The cubic root of 91784161 is about 451.0824329044.

It can be divided in two parts, 917 and 84161, that added together give a triangular number (85078 = T₄₁₂).

The spelling of 91784161 in words is "ninety-one million, seven hundred eighty-four thousand, one hundred sixty-one".